Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions and acid-base equilibria.

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Does solubility product dictate predominant precipitate from the solution with several ionic compounds?

While removing temporary hardness through boiling, magnesium bicarbonate will give $\ce{Mg(OH)2}.$ $\ce{Mg(OH)2}$ predominates over $\ce{MgCO3}$ as the solubility product $K_\mathrm{sp}$ of $\ce{Mg(OH)...
Avaneesh B's user avatar
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Unknown oily substance forming during reaction of concentrated vinegar and calcium carbonate

I was attempting to produce calcium acetate by mixing concentrated vinegar (bought online) and calcium carbonate (sourced from wood ash) and ran a small scale test in a beaker before I reacted the ...
Metal Master's user avatar
13 votes
3 answers
2k views

Do electrons really hang around the electrode while ions go take a swim?

This answer to this post addresses "what happens if you dip a single zinc electrode into some electrolyte solution." It explains that However, though the zinc ion can diffuse through the ...
Buck Thorn's user avatar
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Does Calcium Carbonate dissolve in an aqueous solution of sodium bicarbonate?

A countertop company (Wilsonart) advises the use of sodium bicarbonate to remove limescale (solid calcium carbonate) from the worktop surface. Acidic solutions are contraindicated because the ...
ealdwulf's user avatar
1 vote
1 answer
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Why does balancing the oxidation of dichromate(VI) to chromium(III) require six iron atoms?

The problem: Balance the following chemical equation using oxidation numbers: $$ \ce{Fe^2+ + Cr_2O_7^2- -> Fe^3+ + Cr^3+} $$ What I have tried: $$\ce{\overset{+II}{Fe}^{2+}(aq) + \overset{+VI}{Cr}...
Nora's user avatar
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Who is more polar: acetonitrile or methanol?

According to data dipole moment of acetonitrile is around 4 while that of methanol is 1.7 but is said that acetonitrile is more soluble in non polar solvent that methanol. But shouldn't methanol be ...
T J's user avatar
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Stability of n-Dodecyl-beta-D-maltoside in buffer solutions for assay experiments

I have a buffer system which contains multiple salts and in addition DTT and n-Dodecyl-beta-D-maltoside. I understand that DTT is hydrolysing quite fast and this component must be used always fresh ...
raptorlane's user avatar
2 votes
2 answers
125 views

In an unsaturated solution, is the product of ions still equal to Ksp?

Suppose I have a solution of a sparingly soluble compound, and consider its solubility in g/L. If I have less g/L of solution than that amount, it means the solution is unsaturated, but what happens ...
odin98's user avatar
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2 votes
2 answers
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My textbook writes hydronium ion as [H(H2O)]+, is this correct? [closed]

[...] Thus, it bonds to the oxygen atom of a solvent water molecule to give trigonal pyramidal hydronium ion, $\ce{H3O^+}$ $\ce{\{[H (H2O)]^+\}}$ (see box). In this chapter we shall use $\ce{H^+(aq)}$ ...
Hdje's user avatar
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Estimation methods for temperature evolution of a high $\Delta H_{mix}$ dilution ($\ce{KOH}$ in water)

Question up front: Can temperature evolution in solutions be short-hand-estimated by simple state based calculations - with reasonable expectations of precision? (+/- 10° C) I am trying to calculate ...
Stian's user avatar
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Solubility of hydrogen

I'm interested in bacterial fermentation which produces molecular hydrogen as an end product. If bacteria produce molecular hydrogen in solution under anaerobic conditions, does this remain dissolved ...
JadeD's user avatar
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What does it mean for a substance to be "sparingly soluble"?

I have trouble understanding what solubility means. Merriam-Webster defines it as follows: 1 the quality or state of being soluble 2 the amount of a substance that will dissolve in a given amount of ...
odin98's user avatar
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2 answers
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What is the hydrated diameter of a lithium ion?

When salts dissolve in water, the anions, cations, and strongly polar water molecules undergo hydration reactions, resulting in the formation of hydrated ions with a specific number of coordinated ...
陈永曜's user avatar
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Why does balancing the reduction of dichromate(VI) to chromium(III) require four water molecules among the products?

Problem Balance the following chemical equation using oxidation numbers: $$\ce{Cr2O7^2–(aq) + HNO2(aq) –> Cr3+(aq) + NO3–(aq)}$$ Solution (in Swedish) $$\ce{\overset{+VI}{Cr}_2O7^2–(aq) + H\...
Nora's user avatar
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Soluble Ion separation [closed]

Is it possible to separate ions dissolved in solution? I know that the charges have to be balanced, so thinking that maybe it is possible to artificially give that charge? Take for example, sodium ...
Trey Dean's user avatar
1 vote
0 answers
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Increasing energy density for flow batteries with water based electrolyte?

Given a flow battery with a water based electrolyte, would it be possible to increase the energy density of battery by precipitating the redox active species from the anolyte and catholyte solutions? ...
Lance Collins's user avatar
1 vote
3 answers
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Aqueous state on CO2 and O2 in the Photosynthesis Chemical Equation

While reading through a book I came across the equation for photosynthesis: $$ \ce{6CO2(aq) + 12H2O(l) -> C6H12O6(aq) + 6O2(aq) + 6H2O(l)}\tag{1} $$ in the presence of sunlight + chlorophyll. For ...
entropy's user avatar
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Freezing of a beverage

I am trying to generally describe the process of freezing beer and how the different ingredients influence the freezing process. My general approach right now is to observe a beer as 90% water and 10% ...
Maxim's user avatar
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Mass of gaseous ammonia required to prepare ammonia solution of a given pH

How many grams of gaseous ammonia do you need to make $\pu{200 mL}$ aqueous ammonia solution with $\mathrm{pH} = 11.34?$ As the mole ratio is the same for $\ce{H+}$ and $\ce{NH3},$ $$\ce{NH3 + H+ -&...
Allistor's user avatar
1 vote
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visualization problem of dilution of enthalpy $\Delta_{dil} H$ data with different initial concentrations

description I have a question about the $m_f$ vs. $\Delta_{\text{dil}} H$ plot in some experimental studies. For example, the dilution-of-enthalpy data at 300 °C with two initial concetration ($m_i$) ...
acaduck's user avatar
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1 answer
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Is it possible to make acids and bases in amphiprotic solvents other than water [closed]

In such solvents, could there be chemicals which could donate/accept protons, and if so could their solutions display acidic/basic properties?
Mark R's user avatar
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2 votes
2 answers
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Changes of colour of sunset yellow in water

I am conducting an experiment on “sunset yellow (FCF)”. Based on my observations, the substance, when in powder form, is bright red in colour (observed with naked eyes). When I dissolve the powder in ...
Freeby Freeby's user avatar
-1 votes
1 answer
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what will happen if we add lithium cobalt oxide into water?is it true that molecule will break and lithium will make LiOH and CoO2? [closed]

I have tried to dissolve powder coated on cathode of lithium ion batteries.
Talha Ahmed's user avatar
1 vote
0 answers
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How can we prevent retrogradation of starch?

Are there any additives which can prevent retrogradation of starch? I have prepared 13% of starch solution along with 2% of NaCl. The results were bit better. The synthesized gel was flowable with ...
Aqib Mehmood's user avatar
-2 votes
1 answer
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Small (personal) scale sea salt production?

I was looking to try to make a small setup for producing small amounts of sea salt. Ideally a series of evaporation chambers, with a heavy brine as the finished product, that could then be baked. May ...
user139996's user avatar
-2 votes
1 answer
149 views

I'm writing a theory for a game called Timberborn, but I need help identifying a chemical from it [closed]

As the title says, I'm trying to write a theory for a game called Timberborn where I figure out the backstory of the game. But I need help identifying a chemical in the game. It's called Badwater, and ...
Anonymous's user avatar
0 votes
2 answers
137 views

dilution and pH and pOH

The question is: given a $10$ ml solution with pH = $12.3$, which is then diluted to a $100$ ml solution, find the pH of the new solution. My attempt was as follows: [H$_3$O$^+$] = $10^{-12.3}$, and $...
Martin Westin's user avatar
-1 votes
1 answer
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meaning of ingredient labelling `w/v`

A mouthwash states it has among other ingredients, menthol 0.042% w/v. What is the correct interpretation? This chemistry.stackexchange.com answer says it's weight per volume with unspecified units, ...
H2ONaCl's user avatar
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How can the Kw of water be constant?

I know in neutral solution, $\ce{[H+]}= \ce{[OH-]}= \pu{1.0 x 10^-7}$. However, let’s say I add an acid like HCl. This will increase $\ce{[H+]}$, therefore it’s no longer $\pu{1.0 x 10^-7}$, but is ...
Maria's user avatar
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0 answers
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Preparation of copper carbonate from copper acetate and sodium carbonate

I reacted copper acetate with sodium carbonate. It formed a mixture of sodium hydroxide, copper carbonate, copper acetate, and copper oxide. I wanted to know if there is a process to remove the sodium ...
Just a Hobby chemist's user avatar
2 votes
1 answer
427 views

What green and orange solids did I get when I mixed copper acetate and sodium carbonate?

I tried to make copper carbonate by mixing copper acetate with a sodium carbonate solution. I was expecting to see a light blue solid form at the bottom of the beaker and instead I found a green ...
Just a Hobby chemist's user avatar
0 votes
1 answer
167 views

When does "always add acid" not apply? [duplicate]

I've been taught a LONG time ago to AAA "Always Add Acid". I've recently come across what feels like an exception to that rule when making piranha solution (you add the H2O2 to the acid). I'...
user1816847's user avatar
4 votes
1 answer
61 views

Would having a greater H-bond donor count make a substance more readily enter a twig?

Yes, weird plant scientist asking weird plant questions... Background: I am looking at how the twigs of trees absorb water, a poorly understood means by which trees alleviate water stress. Of 4 ...
treee's user avatar
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4 votes
1 answer
577 views

Possible technique for measuring pH in solutions

I would like to develop a device that measures pH in aqueous solutions. I'm not a chemist, but I have some basic knowledge about electrochemistry. So, I thought I could use two electrodes quite close ...
Andrea's user avatar
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0 answers
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Is there any equation to predict the salting out concentration of a polymer?

I have to roughly calculate the salting out concentration of a polymer with respect to NaOH. Is there any method to calculate?
Kavindu Lochana's user avatar
-4 votes
4 answers
157 views

Drying salts with HCl solution

I'm following a protocol from some old literature (1962), and I want to make sure I'm being safe. It asks you to dissolve some salts in 150 mL water + 25 mL concentrated HCl, then evaporate to dryness ...
ike9898's user avatar
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0 answers
60 views

Can we add specific conductivities at any concentration?

Suppose we have specific conductivities of $\pu{0.1 M}$ $\ce{K+}$ and $\pu{0.1 M}$ $\ce{Cl-}$. Can we add their specific conductivities to get specific conductivity of $\pu{0.1 M}$ $\ce{KCl}$?
McArthur's user avatar
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0 answers
59 views

What is the name of the bond between oxygen atoms and Na+ ions when NaCl dissolves in water?

When NaCl (sodium chloride, table salt) dissolves in water, the NaCl molecules break apart. The hydrogen atoms form hydrogen bonds (I think?) with the Cl- ions. What is the name of the bond between ...
Jake Levi's user avatar
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5 votes
2 answers
774 views

Residue left after evaporation of a salt solution

When a salt solution is evaporated (bunsen burner, evaporating dish/beaker), for example CuSO4 aq, there will be residue left over, as with all salt solutions. However, the common form of copper (II) ...
Jay Chen's user avatar
4 votes
1 answer
198 views

How does a silver chloride electrode (Ag/AgCl) convert the potential in aqueous solution to the wire?

I am aware of the redox chemistry that happens at the electrode surface, but I'm not sure how exactly a change in electrical potential in the solution would change the potential in the electrode?
Anthony's user avatar
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1 vote
1 answer
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Solubility of SrF2 in aqueous solution of NaF

This might be really simple question but I have no idea how to proceed to solve such kind of question. The solubility product of $\ce{SrF2}$ in water is $\pu{8E-10}$. Calculate its solubility in 0.1M ...
izack's user avatar
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2 votes
1 answer
127 views

Reducing vaporization of concentrated hydrochloric acid solution

I have this bottle of hydrochloric acid solution. Although I do not know its concentration but I know it is quite concentrated. Every time I open it the fumes would get to all the places. I have an ...
sfbk's user avatar
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-2 votes
1 answer
100 views

Sodium Citrate / Sodium Phosphate Buffer Calculations

I'm trying to work through the calculations of a specific paper (linked here / below) but, my numbers are way off and I can't get them to match for the life of me. I need to make the same buffer but ...
user136195's user avatar
2 votes
1 answer
100 views

Equilibrium Solubility of CO2 in Aqueous Solution and its Dependence on H3O+ Concentration

The equilibrium solubility of $\ce{CO2}$ in an aqueous solution is given by three chemical reactions: $$ \begin{align} \ce{CO2(g) &<=> CO2(aq)}\label{rxn:R1}\tag{R1}\\ \ce{CO2(aq) + H2O &...
Lineare Libelle's user avatar
1 vote
1 answer
79 views

Are all salts completely dissociated in solution when put in smaller amounts than their molar solubility?

From what I understand, the solubility is given in terms of molar solubility (or $\pu{K_{sp}}$), from which it can be easily calculated). Indeed, the saturation point represents the maximum amount of ...
odin98's user avatar
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1 vote
1 answer
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Scrubbing methanol and ethanol from a gaseous mixture

I have a gaseous mixture (air) at a temperature of approximately 30 degrees Celsius in which the following gases are present: Oxygen 0 - 25% Carbon Dioxide 0 - 20% Methanol 0 - 100 ppm? Ethanol 0 - ...
DenmarkViking's user avatar
-4 votes
2 answers
79 views

Successive deprotonation - how far can it go?

It has been written that among the equilibria of the dissolution of $\ce{SO_2}$ in water, the dissociation of sulphur dioxide into $\ce{HSO_3^-(aq) + H_3O^+(aq)}$ is a complete dissociation. See the ...
user110391's user avatar
3 votes
1 answer
368 views

How do I make a 6-mercapto-1-hexanol (MCH) aqueous working dilution?

I am using 6-mercapto-1-hexanol (MCH) as part of the immobilization procedure for forming a self-assembled DNA monolayer on a gold surface (see the first figure of this paper for a good visual ...
Rory Majule's user avatar
1 vote
0 answers
228 views

What is a suitable process to eliminate an excess of pyridine from an aqueous solution?

I have a reaction in which pyridin is used as a reagent in excess. The resulting product is water soluble and an anion. Pyridinium there will act as a counter ion. Normally, when the product is ...
raptorlane's user avatar
-2 votes
2 answers
113 views

Is the hydrolysis of a salt produced by neutralisation a secondary reaction? [closed]

I understand that in a solution, the salt created by a neutralisation reaction can react again with water molecules, which can further affect the pH. Is it correct to say that the hydrolysis of salts ...
cabbagesss's user avatar

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