# Questions tagged [solutions]

This tag should be applied to questions dealing with solutions of any kind. A solution is a liquid or solid phase containing more than one substance where, for convenience, one (or more) substance(s) called the solvent is treated differently from the other substances, which are called solutes. If water is the solvent, then the more appropriate 'aqueous-solution' tag should (also) be specified.

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### Diffused Layer ion in Electrix Double Layer

When KI is added to AgNO3 soln, so AgNO3 is in excess, collidal particle is AgI:Ag+ with diffused layer of I-, Why is the diffused layer not of NO3- when the anion in excess is NO3-? If we had KI in ...
3k views

### Boiling point elevation for a mixture of ethanol and water

Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. ...
766 views

### Finding the mole fraction

At $25\ \mathrm{^\circ C}$ the vapor in equilibrium with a solution containing carbon disulfide and acetonitrile has a total pressure of $263\ \mathrm{torr}$ and is $85.5\ \mathrm{mol}\text{-}\%$ ...
2k views

### How to calculate the new concentration of a solution after adding more solute and convert it to ppm?

My question is the following: $2~\mathrm{g}$ table salt is added to $0.5~\mathrm{m^3}$ water whose salt concentration is $10~\mathrm{mg\,L^{-1}}$. Compute the salt concentration of the mixture in ...
383 views

### What happens to the attraction of glycerol to a positively charged acetate rod if water is added

I know that glycerol is more polar than water because it has stronger intermolecular forces and its also more viscous. If I were to add water to a glycerol solution, would the solution get less polar ...
77 views

### How to quantify the amount of paracetamol present

What is the most accurate way of determining the number of moles of paracetamol from a solution, mixed with acid or base? I do not have access to more advanced laboratory methods like liquid ...
25 views

### How to sequester Na+ which prohibits the formation of a micro-emulsion in solution

I am mixing alkaline solutions ($\ce{Na2CO3}$) with crude oil containing carboxylic acids to create micro-emulsions. The carboxylic acids react with the alkaline moieties to create an in-situ ...
5k views

### What is the difference between reacting and dissolving?

When one chemical is added to another how would we come to know whether the compound dissolves in it or reacts with it? For example $\ce{AgNO3}$ dissolves in $\ce{CCl4}$ whereas it could also have ...
447 views

### acids, bases, salts, etc

All the chemical compounds can be categorized as acids, bases, and neutral compounds. There are different theories, namely Arrhenius Theory, BrĆønsted-Lowry Theory, Lewis Theory, which define the acids ...
7k views

### Mixing polar and non polar substances [duplicate]

According to the theory of London dispersion forces, intermolecular forces are created in non polar substances by induction of instantaneous dipole to neighbouring molecules. If that is the case then ...
410 views

### How much water has boiled off when precipitation begins? [closed]

Here's a challenge problem I created! None of my students could get it; can you? $25$ grams of table salt (NaCl) is dissolved in $150$ grams of water. The temperature of the solution is raised to its ...
101 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 ...
350 views

### how are colloids and suspensions solutions?

my definition of solution is a homogenous mixture of a solute and solvent. and in my textbook they call colloids and suspensions solutions . how is this possible if both of them are heterogenous ...
534 views

### Find the molarity of the filtrate

I can't figure out this stoichiometry question! 10.0 mL of 1.15M copper(II) nitrate reacted with 20.0 mL of .85M ammonium hydroxide. The solution is filtered. Determine the molarity of the filtrate. ...
776 views

### How to dissolve cat hair without effecting fabric?

I am wondering if it is possible to create some sort of a solution that will dissolve cat hair (or dog hair), but, is not harmful to the surrounding fabric? I am picturing a solution you would soak a ...
106 views

### I need help finding several immiscible liquids [closed]

I am trying to fill a vial with as many immiscible liquids as possible so that they form many separate layers. I want to do this as a way to visualise how liquids with different refractive indexes ...
81 views

### Can compounds dissolved in different miscible solvents react?

For example, can crystal iodine dissolved in ethanol react with sodium thiosulfate dissolved in water when mixed together?
802 views

### Phenolphthalein Indicator mixed with base that first turns pink and then clear

What occurs in the following situation: After adding 2 drops of Phenolphthalein Indicator (an indicator that turns bases pink and stays clear for acids,) into a unknown solution, the solution turns ...
955 views

### Methyl Orange Indicator-Reason for small amount of NaOH [closed]

I used methyl orange as my indicator to titrate a weak acid: At first, I added 3 drops of methyl orange to a solution of the weak acid, $\ce{CH3COOH}$, and the solution turned red. Then, after adding ...
88 views

### Wouldn't adding a proton acceptor still make a solution just as acidic?

Say if you add NH3 to a solution, and it accepts a proton, it still becomes NH4+ in a solution, which is also acidic. A base should decrease the hydrogen ion concentration in a solution, but how does ...
305 views

### Doesn't Ostwald's law of dilution contradict Le Chatelier's principle?

By Le Chatelier's principle, increasing the concentration of a weak electrolyte brings out more ions. By Ostwald's dilution law, increasing the concentration of a weak electrolyte brings out less ...
30k views

### Chemical Reaction of aluminum foil in CuCl2 solution

In class we did a lab in which we first dissolved copper(II) chloride powder in water to form a blue solution. We then placed a crumbled up piece of aluminum foil in that solution. It turned brown ...
618 views

### Calculate pH of a mixture of a strong base and acid. Knowing only the pH, wt/v%, and volume of both solution. [closed]

Title explains all. I have been stuck on this for an hour and for some reason cannot understand it. I have tried to do an ICE table but get stuck halfway as I do not know whether I would use the w/v ...
1k views

### How many grams of CuSO4*5H2O yield 10 grams of H2O?

If I want there to be 10.00 g of water in the copper (II) sulphate pentahydrate sample that I'm measuring, what mass of the substance will I need in order to have 10.00 g of water? I solved this ...
4k views

### What actually happens when citric acid is added to a highly alkaline soap solution?

A few days ago I made an experiment. I diluted a few small chunks of bar soap with 20 ml of water. I then measured the ph of the solution which was around 10. I then added a tiny amount of citric acid....
70 views

### Why does a proton react with water to form hydronium ion and why does that ion has an overall positive charge? [closed]

Take this is an example: $$\ce{HCl(aq) -> H^+(aq) + Cl^-(aq)}$$ and $$\ce{HCl(aq) + H2O -> H3O+ + Cl^-(aq)}$$ Clearly the proton latches on to the water molecule but why? Also, why does the ...
103 views

### Copper anode dissolves in electrolysis of copper sulfate solution [closed]

I did an experiment with copper sulfate where you place two copper rods in an aqueous solution of copper sulfate. You apply an electric current and copper metal builds up on the cathode. I noticed ...
64 views

### How does sodium rosinate enhances lathering property? [closed]

Why don't we use sodium carbonate or sodium stearate? What does sodium rosinate contain that the other two don't?
44 views

### Difference between homogeneous and heterogeneous mixture [closed]

When i mix two equal but large number of stones it is possible (though extremely unlikely) that stone a and stone b perfectly segregate themselves into two halves or that they are uniformly ...
309 views

### Is vapour pressure a surface phenomenon?

As a fact, I know that vapour pressure doesn't depend on surface area. Does this imply it is not a surface phenomenon also? It shouldn't be as then it would depend on surface area of molecules and ...
51 views

### Titrations in three equibilums

You have three solutions: 0.1 M solution of a weak monovalent acid 0.1 M solution of a strong monovalent acid 0.1 M solution of a weak divalent acid Each solution is titrated with 0.15 M NaOH. What ...
149 views

### What's the identity of the crystalline solid in the following reaction? [closed]

A mixture of toluene, benzoic acid, aniline and phenol was dissolved in diethyl ether and extracted with 5% $\ce{NaHCO3}$ solution? This extract was acidified until a white crystalline compound ...
805 views

### Is it possible to detect and measure the amount of potassium sorbate used to preserve fruit juice?

In a store bought fresh orange juice that is preserved using potassium sorbate is it possible to detect the presence of potassium sorbate and also measure the amount present? What methods of testing ...
52 views

### Can course salt melt into water [closed]

What can cause course salt to melt? If you put it on a flat surface, can it melt on its own into water? What causes this reaction to make the salt melt?
98 views

### The Definition of a Solution

Can there be more than one solute or solvent in a solution. Why? Why not? The largest component in the solution is called a solute and smallest a solvent. How is this possible when solutions contain ...
3k views

### Mole fraction of solute of a dilute solution

According to our book, when the solution is dilute, the mole fraction of solute can be given as: X2 = molality (m) x mass of solvent (M1) / 1000 Actually it is written as: X2 = m/(1000/M1) How is ...
47 views

### Cross checking the fact that gas solubility decreases with temperature increase and Henry's law's validity

It is known that the solubility of gas decreases with increase in temperature which is due to the kinetic energy freeing the solute particles into the vapor phase. Henry's law states that the partial ...
50 views

### In a double displacement reaction, why donāt the two products reform after being dissolved in water? [duplicate]

Letās say I have $\ce{AB (aq) + CD (aq) ā> AD + CB}$. When AB and CD are dissolved in water, they get dissociated into their component ions. But why donāt they reform as AB and CD, if it is already ...
42 views

### What is the solubility of d-Glucose in water as a function of temperature? [closed]

I can't find solubility of d-Glucose in water as a function of temperature. I.e. a function that can tell me that at 35 Celsius the maximum amount of d-Glucose that can be dissolved in 100g water is ...
311 views

### Is it possible to prepare a 0.1 N solution of HCl and methanol? [closed]

In my lab guide I read: "Use a $\pu{0.1 N}$ solution of methanol-chloridic acid $(9:1)$ for the anthocyanin extraction", so I tried to calculate the volume of $\ce{CH3OH}$ and $\ce{HCl}$ to prepare it,...
2k views

### Calculate pH at equivalence point [closed]

Calculate the pH at the equivalence point of a titration of 62 mL of 0.1 M $\ce{CH_3NH_2}$ with 0.20 M HCl. The $\ce{K_b}=4.4\cdot10^{-4}$. At the equivalence point, the moles of CH3NH2 equals the ...
146 views

### How to keep raspberry ketone from forming crystals again after dissolving in alcohol?

I dissolved raspberry ketone 700Ā mg in 10Ā ml of 99% isopropyl alcohol. The solubility according to pub chem is 1Ā g/ml. After dissolving, I added room temperature water to bring the final volume to 70Ā ...
47 views

### Molarity of a substance in a solution when more fraction is given

Mole fraction of ethanol in a solution with water is $0.040$. What will be the molarity of ethanol in water? Density of water can be assumed to be $1\ \mathrm{g/mL}$. This is how I tackled the ...
709 views

### How to make a pH 6.8 Tris buffer?

To preface this, I am a biologist. I need to make a $\mathrm{pH}=6.8$, $\pu{1 M}$ Tris buffer. We have access to Tris base and Tris Hydrochloride. (Unfortunately, none of the fancy Tris compounds ...
192 views

### Ethanol in gasoline ā will it evaporate?

If gasoline with 10% ethanol is stored for a few weeks, will the ethanol evaporate? I have read that to check for ethanol in gas is to add a little water to a container; mark the level and add gas. ...
88 views

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