For questions relating to compounds dissolved in water and resulting reactions.
-3
votes
0answers
22 views
Can someone help me identify this solution of water and sulfur? [on hold]
I came across a certain compound recently in class, but I’m not sure at all what exactly it is. It’s a solution of water and sulfur (sulfur compound, maybe?) and...something, I guess. I’m guessing ...
0
votes
0answers
17 views
Atmospheric CO2 Neutralizing Ca(OH)2 in Flume System
The factory I work at has a large flume system that contains sugar and organics. CaO is added to the flume to maintain a 12pH and keep bacterial activity to a minimum. In order to reduce the use of ...
-1
votes
1answer
24 views
Advice on forming a 10% solution of Maltol
I’m having great trouble forming a 10% solution of Maltol. Specifically, I’m trying to dissolve 3 grams of Maltol in 27 grams of solvent.
I’ve tried everything from Propylene Glycol, to Deionized ...
-2
votes
1answer
28 views
Raoult's Law Question [closed]
Question : An ideal solution contains two volatile liquids A(P°= 100 torr) and B(P°= 200 torr). If mixture contains 1 mole of A and 4 moles of B then total vapour pressure of the distillate is?
I ...
0
votes
0answers
20 views
Ions concentration of mixed salts
I’m an amateur in chemistry, so I apologize if this is a too basic question. Background: I want to understand a study of sugarcane growth into solutions containing different nutrients.
I’m creating a ...
2
votes
1answer
38 views
Diluting methanol in water: is it exothermic?
Can someone explain in simple terms why does temperature increase when mixing water with methanol? I do not have a strong background in chemistry, but I usually have to mix both liquids (sometimes ...
-1
votes
0answers
19 views
Titration - Chemistry standardsolution [closed]
A standard solution of sodium hydroxide was prepared by dissolving 2.15g sodium hydroxide in water in a 100cm3 volumetric flask. 10cm3 aliquots of the solution were titrated against hydrochloric acid ...
0
votes
1answer
34 views
Insoluble salts and Gibbs free energy
Is it true that according to gibbs free energy equation, insoluble salts such as AgCl don't dissolve because the process would be too endothermic? The right side of the equation, TΔS, would have to be ...
0
votes
1answer
23 views
Can the ions of dissolved salts be physically separated with a strong enough external electric field?
Say you had a arbitrary amount of sodium chloride dissolved in water. Could an external electric field (e.g. the electrically charged plates in Millikan's oil drop experiment) physically pull apart ...
-1
votes
1answer
15 views
Will a reverse osmosis membrane exclude perfluorobutanoic acid?
I recently did a water quality test and it showed a detectable level of perfluorobutanoic acid, a potentially dangerous carboxylate PFC.
Will a reverse osmosis water purification system exclude this ...
-1
votes
1answer
18 views
Reaction of soluble salts
If we were to mix two soluble salts together, for instance sodium nitrate and potassium chloride together, and their products are also soluble, will any reaction still occur? Say if we were to boil ...
0
votes
2answers
48 views
Wetting agent for H2O2 solution
I need to increase the wetting of an $\ce{H2O2}$ solution on ceramic surfaces. Does anyone know of a common chemical I can use for this?
The properties it would ideally have are:
Increases wetting ...
-1
votes
1answer
62 views
vinegar + baking soda = yields far smaller volume of CO2 gas than calculation
I experimented CO2 generation by adding 4 g of 25% acetic acid water solution (=1g of acetic acid) to 1.4g of pure baking soda. But this mixture yielded only 50% less than the calculated amount 373 mL ...
0
votes
1answer
53 views
Entropy as the driving force for osmosis
How is entropy responsible for osmosis and is movement of solvent possible from its higher concentration to lower concentration?
By concentration, I will be referring to the concentration of solvent ...
-3
votes
1answer
36 views
double replacement [closed]
$$\ce{KNO3(aq) + BaCl2(aq) -> KCl(aq) + Ba(NO3)2(aq)}$$
I found products but I noticed in product that both of them are in the aqueous phase. So actually no reaction occurs?
Does a reaction need ...
2
votes
1answer
112 views
What is the net ionic equation of the following?
Aqueous chlorine is added to a solution of aluminum bromide in a single replacement reaction which forms no precipitate and bromine liquid. Determine the net ionic equation.
Since this is a single ...
0
votes
0answers
35 views
Will magnesium chloride and ascorbic acid react in solution?
Both magnesium chloride dissolved in distilled water and ascorbic acid dissolved in distillled water have been separately shown to have a number of health benefits when applied topically to the skin.
...
0
votes
0answers
28 views
pH calculation of salt in acid
A person go to an all-you-can eat restaurant but eat a little too
much and get heartburn. He returns to his room, looking for a remedy. He takes $3$ teaspoons of milk of
magnesia, which contains $...
-1
votes
1answer
32 views
Water boiling with salt and without it [closed]
Does 1L of water with salt boil faster or slower than one with the same amount of water but without salt?
What I know is that since when you add salt to the water the temperature of boiling increase ...
-1
votes
1answer
36 views
Why don't soluble gases that evolve in a reaction remain in solution?
Take for instance the following process:
$$\text{2NaCl}_{\ (s)} + \text{H}_2\text{SO}_{4 \ (aq)} \to \text{2HCL}_{\ (g)} + \text{Na}_2\text{SO}_{4 \ (aq)} $$
Why does the evolved gas leave the ...
1
vote
1answer
58 views
Diffusion of CO2 and O2 in Water/Atmosphere System
Consider the following experiment:
One reservoir of pure water is interfacing the atmosphere at standard condition.
Both are at rest and at the same temperature.
Both have no internal gradients (ie:...
0
votes
0answers
42 views
Beer's law relationship for light scattering at 90 degrees
First-time poster here
In Beer's law, the ratio of incident light intensity, $I_0$, to exiting light intensity, $I$, is defined as $\log_{10} (\frac {I_0} {I}) = \epsilon L c$. Then, by rearranging ...
0
votes
0answers
34 views
Equation of state (EoS) for liquid density, in terms of pressure, temperature and concentration
I'm currently in need of an equation to calculate density of aqueous solutions such as acids, bases, and salts. The equations to calculate liquid density that I have found so far do not account for ...
0
votes
0answers
91 views
Does dissolving sodium carbonate in water produce carbon dioxide?
Does dissolving sodium carbonate in water produce carbon dioxide?
I have been thinking about this for a long time but I'm getting inconsistent answers online.
My thinking is that $\ce{CO3^2-}$ ...
4
votes
1answer
35 views
What is the proper way to prepare a solution aiming to minimize errors?
I am a undergraduate student in chemistry, and my university is very weak in teaching solution preparation. I need to prepare a 10 mg / L methylene blue solution and now the way I do is, using an ...
0
votes
1answer
43 views
Making sulfate from elemental sulfur [closed]
I have $\approx\pu{2 g}$ of elemental sulfur that I need to convert to dissolved sulfate in DI water. What's the easiest lab chemistry that will get me there?
-2
votes
1answer
40 views
Do bases undergo dissociation or ionisation in aqueous solution?
What do bases undergo when dissolved in water: ionisation or dissociation or both? Some books say ionisation while others say dissociation. What is the correct answer?
0
votes
2answers
77 views
Buffer Solution with Strong Acid?
I was thinking: Could we could make a strong acid-strong base buffer solution? Take, for instance, a mixture of 1 L $\ce{HCl}$ (0.1 M) and 1 L of aqueous salt, $\ce{Na_2SO_4}$ (also 0.1 M), note that $...
0
votes
0answers
15 views
How does a negatively-charged ion behave in the electrical field of biphasic systems
The following is the electrostatic potential plot along the z-axis in a liquid-liquid biphasic system (a ionic-liquid vs water).
There are some negatively-charged ions in the positive side of z (z > ...
1
vote
3answers
118 views
How to determine if an unknown is potassium chloride or potassium bromate?
In class, we were given unknown substances. I've narrowed the possible substances down to either potassium chloride or potassium bromate.
We were given several acids, indicators, and other chemicals (...
0
votes
0answers
128 views
pKa Values and the Leveling Effect
I've heard that the leveling effect happens if the pKa of the acid is less than water, but then I've also heard it will happen if the acid is too strong (stronger than Hydronium). Is this correct? Are ...
0
votes
0answers
47 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
32 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
90 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
49 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 ...
3
votes
1answer
181 views
Would the reaction to produce amides from acyl chlorides also produce carboxylic acids?
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
50 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
38 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
177 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
44 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
6 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
35 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
26 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
23 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
33 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 $\ce{...
4
votes
1answer
64 views
How many protons does phenolphthalein lose in basic solutions?
So, I've looked it up and Wikipedia claims that two protons are released by Phenolphthalein when pH is over 8.2, but I've seen other sources that claim only one proton is lost. So, is it really just ...
1
vote
1answer
56 views
Predict melting point of water CaCl2 solution
I'm doing a science project for my school. I experimentally measured the melting point of water-salt solutions, and I want to compare my results to theoretical melting points, but I encountered a ...
0
votes
1answer
20 views
Is there a point where further dilution of ethanol is not exothermic?
Diluting concentrated ethanol with water is exothermic. Diluting 95% refined spirit into 40% vodka makes the resulting product definitely warm. Dilution of 60% absinthe with water that is cool, but ...
5
votes
1answer
87 views
Number of water molecules in a box to simulate liquid water [closed]
I have seen that depending on the simulation approach, different number of water molecules are employed for studying liquid water properties.
32 in early DFT calculations
The electronic structure of ...
0
votes
1answer
109 views
Reactions between aqueous or solid LiOH
I've been working on a project to absorb CO$_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)...
