Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions.

0
votes
0answers
65 views

Two differing methods for vanadium extraction

The following sources (Source 1, Source 2) both cover the extraction of Vanadium (specifically Vanadium Pentoxide, $\ce{V2O5}$) from petroleum residue (petcoke and flyash respecitvely). However when ...
0
votes
1answer
35 views

How to meausre ion interferences in solution?

Is there a way to quantitatively measure the interference of different metal ions in solution? I plan to measure concentration of Pb(II), Fe(II), and Cu(II) in solution together using a ...
-2
votes
1answer
99 views

Find the concentration of proton after adding a acid to NaOH [closed]

I have this simple problem that I cannot figure out though, only the first part. 100 ml of 1.0 $\frac{mol}{L}$ $NaOH_(aq)$ contains ( a ) g of NaOH. After mixing 100 ml of 1.0 $\frac{mol}{L}$ $...
-1
votes
1answer
58 views

How does the water pollutant sodium nitrate affect the concentrations of other ions in tap (dam) water? [closed]

Context In my assignment I've been given two water samples from the hinze dam. The first sample has been untouched, however the second has been contaminated with an unknown ionic compound. To ...
4
votes
2answers
356 views

If acyl chlorides are reacted with aqueous ammonia, will carboxylic acids also be formed?

As part of my A-level chemistry course, I have been taught that an acyl chloride will react violently with water to produce a carboxylic acid and hydrochloric acid. I have also been taught that an ...
1
vote
0answers
54 views

Formulation of a suspension of Magnesium Hydroxide

For a school project of mine, I have to formulate a suspension of Magnesium Hydroxide which contains at least 50% of solid matter. This suspension is prepared from Magnesium Oxide 98% with a ...
0
votes
0answers
42 views

How do concentrations of nitrate in water samples change over time?

Context: (Not necessary to answer the question) For an assignment I am currently testing two samples of water. One is a pre-contamination sample and the other is a post-contaimnation sample. Between ...
-1
votes
2answers
364 views

KCl + CuCl2 in solution, is there a reaction?

I'm wondering if the reaction of $\ce{KCl + CuCl2}$ in solution (aq) will produce any products (have a net ionic equation/solid precipitate)? Using the metal activity series, I see that potassium is ...
0
votes
1answer
49 views

Is the ionic solution of a half-cell part of the electrode in a electrochemical cell? [closed]

A simple electrochemical cell consists of two half-cells, that is: a metal solid submerged in a solution. Additionally, there is salt bridge connecting the half-cells. Ex: $\ce{Cu(s)}$ in $\ce{CuSO4(...
0
votes
0answers
8 views

where to find data on thermal decomposition of polysaccharide in aqeuous solution

This is a follow up of my previous question: "effect of over-pressure on lowering viscosity of polysaccharide solution" I would like to know where to find data on thermal decomposition of ...
1
vote
1answer
53 views

Is the electrical conductivity only measurable in aqueous solutions? [closed]

I have been looking for other ways to measure it, but all I've found is through aqueous solutions. So I want to know if there's another way to do it, or why it isn't possible through other means.
0
votes
0answers
38 views

How can the CO2 released from sodium bicarbonate reacted with HCl lift an alginic raft if the sodium bicarbonate acts first?

In the antacid Gaviscon, sodium alginate reacts with hydrochloric acid and then calcium carbonate to form an alginic raft that is supposed to be lifted to the top of the stomach by the carbon dioxide ...
2
votes
0answers
24 views

Non-hydrate forming salts?

Are there any water-soluble salts that don't form hydrates? Hydration seems very thermodynamically favorable, as evidenced by its abundance. It also makes sense since the solvation and hydration ...
0
votes
1answer
38 views

How to determine which ions will pair to form a compound in an aqueous solution?

Let us assume we have an aqueous solution with the ions $\ce{A+}$, $\ce{B+}$, $\ce{C-}$ and $\ce{D-}$. Which ions will form a bond and why? Will the compound formed be $\ce{AC}$ and $\ce{BD}$ or $\ce{...
4
votes
1answer
106 views

How many protons does phenolphthalein lose in basic solutions?

So, I've looked it up and Wikipedia claims that two protons are released by Phenolphthalein when pH is over 8.2, but I've seen other sources that claim only one proton is lost. So, is it really just ...
1
vote
1answer
63 views

Predict melting point of water CaCl2 solution

I'm doing a science project for my school. I experimentally measured the melting point of water-salt solutions, and I want to compare my results to theoretical melting points, but I encountered a ...
0
votes
1answer
22 views

Is there a point where further dilution of ethanol is not exothermic?

Diluting concentrated ethanol with water is exothermic. Diluting 95% refined spirit into 40% vodka makes the resulting product definitely warm. Dilution of 60% absinthe with water that is cool, but ...
5
votes
1answer
102 views

Number of water molecules in a box to simulate liquid water [closed]

I have seen that depending on the simulation approach, different number of water molecules are employed for studying liquid water properties. 32 in early DFT calculations The electronic structure of ...
0
votes
1answer
160 views

Reactions between aqueous or solid LiOH

I've been working on a project to absorb CO$_2$ from fossil fuel power plants. I found these reactions: $$\ce{2Li(s) + 2H2O(l) → 2 LiOH(aq) + H2(g)} \tag{1} $$ $$\ce{2 LiOH(s) + CO_2(g) → Li2CO_3(s)...
1
vote
0answers
99 views

Why is fluoride good for your teeth?

The main component of tooth enamel is calcium hydroxyapatite. I know fluoride ions can replace hydroxide ions in the enamel matrix, slowing the rate of enamel demineralization. Why does hydrofluoric ...
0
votes
0answers
19 views

Relationship between concentration of catalyst and light produced

I have been trying to find a relationship between increasing concentrations of potassium ferricyanide and the light intensity produced by the oxidation of luminol by hydrogen peroxide to explain some ...
0
votes
0answers
52 views

Relative concentrations of ions in acid-base reaction

An aqueous solution of ammonia has of pH = x, and a solution of hydrochloric acid has pH =y; it is also known that x + y = 14, and x > 11. If equal volumes of these two solutions are mixed together, ...
2
votes
2answers
90 views

Crystallisation problem

I have an aqueous solution of N,N-dimethylphenylalanine methyl ester hydrochloride and I need to crystallise it as a salt. I'm afraid of increasing the temperature or the concentration of acid due to ...
0
votes
1answer
53 views

Calculating the change in pH upon diluting an acid

What volume of water is added to $\pu{400 ml}$ of $\ce{HCL}$ solution so that the pH of the solution increases by 1 unit This is how far i went but the answer says $\pu{1000 ml }$ where am I wrong is ...
0
votes
1answer
58 views

Chemiluminescence of luminol

Recently I have tried to perform an experiment with luminol and hydrogen peroxide (with potassium ferricyanide as the catalyst). Upon googling, I found two ways to conduct this experiment and was ...
-1
votes
1answer
257 views

Can you create pure sodium metal by electrolysis of aqueous NaCl rather than molten NaCl?

I was researching how to make pure sodium from salt because I think it would be interesting to do. In all of the articles I read that talked about using NaCl they said to melt it and then use ...
1
vote
3answers
255 views

Saturated vs Supersaturated

The way I was told is that a saturated solution contains the maximum amount of solute and a supersaturated solution contains more solute than a solution can hold at a particular temperature. But I was ...
3
votes
1answer
68 views

Flaw in my logic on Henry's Law?

It states mathematically $ p=Kx $ where $x$ is mole fraction of dissolved gas and $p$ is partial pressure of the gas. Dissolution of gases is exothermic, so with increase in temperature, solubility $x$...
1
vote
0answers
51 views

Can a molecular sieve be used increase the saturation of a fructose solution?

The Problem: Let's say we have an experiment where we are attempting to grow rock candy crystals by letting a solution of sugar crystalize on a wooden dowel. However, an error may have been made in ...
0
votes
0answers
26 views

Determination of Sorbitol in Diabetic Marmalade

A sample of diabetic marmalade ($\pu{0.100 g}$) after suitable treatment, was titrated with aqueous sodium iodate(VII) ($\pu{1.00 mol dm^-3}$), and $\pu{1.63 cm^3}$ of titrant was required for ...
-4
votes
2answers
488 views

Why does acetic acid (CH3COOH) conduct electricity the worst in comparison to HBr, HCOONa and NaNO3 [closed]

Which of the given substances (in an aqueous solution) conducts electricity the worst: $\ce{CH3COOH}$, $\ce{HBr}$, $\ce{HCOONa}$ and $\ce{NaNO3}$? I've found this assingment included in the 2017 ...
1
vote
0answers
15 views

Acid/base separation in nanofiltration

How do semi-permiable membranes handle salts that can separate into an acid and a base based on the "rules" of the membrane? For example, say I have a nanofiltration membrane that rejects ...
1
vote
1answer
138 views

What is happening to my chlorine dioxide when I add too much bleach or citric acid?

I have some sodium chlorite and Chinese mystery powder which are meant to be mixed with water, then mixed together to form chlorine dioxide. I wanted to try a more food safe (and less mysterious) ...
-2
votes
1answer
191 views

What's the role of sodium carbonate and hydrochloric acid for the neutralization of disaccharides into monosaccharides?

A couple of days ago we conducted the following experiment at school: Add 5mL of an aqueous solution of sucrose ($\ce{C6H22O11}$) to 1mL of concentrated hydrochloric acid and heat it for 10 minutes....
4
votes
1answer
89 views

Why is Iron very rare in seawater compared to many other elements?

I don't know the associated technical words to research this question. There was high presence of Iron in the oceans in anoxic precambrian times, and today copper is 5 times more abundant in the ...
0
votes
1answer
37 views

How to evenly mix NaCl and Lactose

Q: You have 10 g NaCl (s) and 90 g Lactose (s) (both easily soluble in water.) You want to achieve a 100 g mixture of these two compounds in solid form where they are completely evenly mixed. (A 1 mg ...
2
votes
1answer
332 views

What is a suitable acid to remove limewash from masonry brick

Diluted Hydrochloric acid is often touted as the only thing to remove limewash from masonry but the process is dangerous and can adversely affect the bricks, color changes can readily occur. Is there ...
2
votes
1answer
81 views

Will the carboxylate groups of the citrate anion undergo hydrogen bonding?

The citrate anion of trisodium citrate has three carboxylate groups. I am concerned with whether or not there will be hydrogen bonding in water, with hydroxyl groups of other ions or alcohols. It has ...
8
votes
2answers
779 views

What acid can dissolve thorium dioxide?

In one of my projects (which is about alpha-voltaic cells, don't worry, I know that thorium isn't a strong alpha source, it's only for measurements) I would need to get water soluble thorium compound ...
1
vote
2answers
1k views

Why does buffering capacity increase with the pKₐ of the acid component?

For example, the $\mathrm{p}K_\mathrm{a}$ values of ethanoic, propanoic, and butanoic acid are related in the following way: $$\text{ethanoic} < \text{butanoic} < \text{propanoic}$$ And their ...
-1
votes
1answer
1k views

Identifying amphiprotic species

I'm a bit confused about amphiprotic species – specifically why some species can be amphiprotic and others can't. For instance, $\ce{SH-}$ is an amphiprotic species (in aqueous solution). $$ \begin{...
5
votes
3answers
468 views

Calculating the density of a saturated salt solution

Is there a way to calculate the density of a saturated salt solution from the solubility limits or does it have to be experimentally determined? First instinct, is to add the mass of the salt to ...
-1
votes
1answer
89 views

Determine concentration of phosphate after copper(II) oxalate is precipitated

Solution with $\ce{Na3PO4}$ with $\pu{0.02 M}$ concentration and $\ce{Na2C2O4}$ with $\pu{0.03 M}$ concentration. I add excess $\ce{Cu(NO3)2}$ very carefully – tiny amounts. What will be my $\ce{PO4^...
1
vote
0answers
33 views

Conductivity variation on Caustic (NaOH) Dilution System

I am reading the drawing for an automatic caustic dilution system where 50% NaOH is diluted down to 20%. I was expecting to see a density sensor on the outlet to provide feedback to the dilution ...
-3
votes
1answer
111 views

Molarity of silver(I) nitrate solution after the reaction with magnesium [closed]

$\pu{3 g}$ of $\ce{Mg}$ are placed in $\pu{500 mL}$ of $\pu{0.625 M}$ $\ce{AgNO3}$. When the reaction is complete, what is the molarity of the $\ce{AgNO3}$ solution? I'm thinking you need to use $...
3
votes
1answer
45 views

Using cryptands to make a negatively-charged solution?

In our discussion group, my friend mentioned that metal cations can be separated from other cations in solution using cryptands. After addition of the cryptands to the solution of the cations, ...
2
votes
0answers
123 views

Varying data about solubility of sodium acetate trihydrate

I recently looked up the solubility of sodium acetate trihydrate in water at 20°C and found surprisingly diverse values such as: 613g/l (GESTIS-Stoffdatenbank) 762g/l (TU Freiberg) 1250g/l (applichem, ...
1
vote
0answers
25 views

Potentiometric determination of fluoride

We did an experiment of potentiometric determination of fluoride ions. In several beakers we added several concentrations of NaF solutions and then we added water. We calculated with the electrode the ...
1
vote
1answer
351 views

Molality of the solution prepared from a hydrated salt

A solution is made up by dissolving $\pu{13.8 g}$ $\ce{Na2CO3 · 10 H2O}$ in $\pu{103.5 g}$ of water. What is the molality of $\ce{Na2CO3}$ in this solution? I can't solve it. I tried converting to ...
3
votes
2answers
534 views

How to dissolve white dextrin in water?

Dextrin is labelled as highly soluble in water. I have white dextrin (analytical from Sigma Aldrich). When I mix it in water, no matter how long I stir and how little dextrin I put, I get a suspension....