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.

Filter by
Sorted by
Tagged with
2 votes
0 answers
54 views

Why aluminum does not form ammonia complex ion?

I learned in my textbook that zinc forms more stable complex ion with NH3 than OH- because NH3 has only one lone pair and that makes repulsion between d orbital electron in zinc and lone pair electron ...
0 votes
0 answers
24 views

When is a solution supersaturated? [duplicate]

When does a solution become supersaturated? From a little search on Google I found that, increasing the temperature of a saturated solution and adding some more solute until it starts to precipitate ...
-1 votes
1 answer
56 views

How do I interpret the dissolution rate unit? [closed]

I have found a paper (link) that is interesting for my research project. The dissolution rate unit in this paper is described as $\pu{mol/cm^2/s}$. For my project I would need the dissolution speed ...
1 vote
0 answers
25 views

Can micelles form in a polar-vacuum interface?

As the formation of micelles depends on, among many factors, the difference of polarity/relative permittivity of the solvents involved with the surfactant, I'm wondering if a polar-vacuum system is ...
0 votes
0 answers
38 views

Disposal of Metal Ion Solutions After Flame Test

I just bought a flame-test spectroscopy kit to use with our small homeschool group. It includes calcium chloride, potassium chloride, strontium chloride, and lithium chloride. I also bought a bottle ...
10 votes
3 answers
2k views

Why is there a decrease in the total volume when NaOH dissolves in water?

When a solute is added to a solvent, the volume of the solution should be equal to the sum of the individual volume of the solute and solvent (i.e total volume), right? But why is there a decrease in ...
-1 votes
1 answer
23 views

Will the solid formed after dehydration of a disodium hydrogen phosphate + sodium hydroxide solution be hygroscopic at STP?

Given a solution consisting of disodium hydrogen phosphate + sodium hydroxide (approaching a pH of 12), will the solid formed after dehydration of the solution be hygroscopic at STP? Which salts are ...
-2 votes
2 answers
52 views

Can ions be acids or bases?

Consider a sulfate ion, its considered a weak base. Yet I thought bases and acids were compounds meaning they were always electrically neutral? Why is a sulfate ion then considered a base? And how ...
-1 votes
1 answer
64 views

Safely removing sodium hypochlorite crystals from hard-to-reach surfaces

I have a small bathing whirlpool which wasn’t used for over ten years. It is built into the ground and I cannot reach the disinfectant container to replace it with a new one. I can access the fill-...
2 votes
2 answers
47 views

How to remember what measure of concentration to use for colligative properties

Like the title says, how do I remember what measure of concentration(molality, molarity, mole fraction) to use for various colligative properties such as increase in boiling point when a non-volatile ...
-2 votes
1 answer
85 views

How does adding oxalic acid to water change the volume of the solution?

Does $\pu{87.4 mL}$ of $\ce{H2O}$ and $\pu{12.6 g}$ of $\ce{HOOC-COOH.2H2O}$ create $\pu{100 mL}$ of a solution? So in our practical class our teacher wanted to make $\pu{100 mL}$ $\pu{1 M}$ aqueous ...
1 vote
1 answer
73 views

Finding the density

35.6g of NaOH is dissolved in 150g of 20% NaOH solution. What is the density od the solution? I have tried solving this problem, but I 've come across a few obstacles. Firstly, I found the mass of ...
5 votes
1 answer
169 views

Why does the 1H NMR spectrum of methacryloyl chloride show two singlets instead of two doublets for vinyl protons?

Based on what I have understood, for methacryloyl chloride there is a geminal coupling of the vinyl protons since they are not chemically equivalent. Why are two singlets observed for vinyl protons ...
  • 83
1 vote
1 answer
43 views

Is vapour pressure truly a colligative property?

Colligative properties are generally defined as A colligative property depends only on the ratio of the number of particles of solute and solvent in the solution, not the identity of the solute. ...
  • 117
0 votes
0 answers
29 views

How to measure pottery glaze leaching?

I am looking for a way to know if glazes from pottery leach chemical compound in water. Those are usually metal ions: cobalt, manganese, chrome, etc. The procedure would be to place hot water in the ...
  • 1
-1 votes
3 answers
202 views

Why does equilibrium of ice and water only exist at 273K at normal pressure?

I am a high school student and I am a little confused in the concept of spontaneity of a reaction and how equilibrium works for a reaction, I got some confusions: Let's take example of freezing of ...
1 vote
0 answers
47 views

What is the necessary and sufficient condition for a mixture to be ideal?

I am trying to understand some concepts from solution thermodynamics related to ideal mixtures and fugacity. My main question is what is the necessary and sufficient condition for a mixture to be an ...
-3 votes
1 answer
47 views

pH calculation of a mixure containing 2 strong acids and a buffer mixture

Calculate the pH of a mixtureof 10 mL 0,1 M HCl ; 5 mL 0,1 M HNO3 ; 10 mL 0,2 M HAc ; 15 mL 0,4 M NaAc. My understanding was that I have to find the [H+] by: finding the concentration of the products ...
  • 11
3 votes
1 answer
87 views

Variation of conductance of saturated aqueous solution with temperature

The following question was asked in JEE Mains 2020: Let $C_{\ce{NaCl}}$ and $C_{\ce{BaSO4}}$ be the conductances (in S) measured for saturated aqueous solutions of $\ce{NaCl}$ and $\ce{BaSO4}$, ...
0 votes
0 answers
25 views

How do I determine if a nucleophile attacks the electrophilic atom directly or indirectly?

How do I determine if a nucleophile attacks the electrophilic atom directly or indirectly? For instance a nucleophile could attack the carbon in a molecule with a carbonyl directly, but in another ...
2 votes
0 answers
44 views

Gouy-Chapman model

Recently I have been investigating the problem of a neutral solutions (with equal number of anions and cations) interacting with an infinite surface $z=0$ with electrostatic potential $\phi(z=0)=\...
  • 121
-3 votes
2 answers
108 views

why is humid air an example of liquid gas solution instead of gas gas solution? [closed]

In my textbook, humid air is given as an example to liquid in gas solution. But isn't humidity the amount of water vapour (gas) and therefore should be gas in gas solution?
-2 votes
1 answer
53 views

Can Bromophenol Blue Sodium Salt, and Pentane be safely mixed/in contact with each other?

I'm trying to determine if powdered Bromophenol blue is safe to mix with Pentane. I would only need a tiny amount of dye, just enough to tint the pentane. I need to use pentane for it's specific ...
  • 3
0 votes
0 answers
33 views

Liquid water barrier and water vapor permeable membrane sheets

I am running an experiment where I am trying to maintain the relative humidity of a thermally insulated chamber. I am successfully able to hold the humidity using different salt solutions (NACL-75% RH,...
  • 29
-2 votes
1 answer
48 views

Why doesn’t ferrous sulfate appear orange in vinegar?

When I mix ferrous sulfate crystals with water, the solution almost immediately turns orange. However, when I mix ferrous sulfate with vinegar, it doesn’t change colors. Why is this?
-4 votes
1 answer
34 views

Separation methods [closed]

I put some iron nails in water, and obviously, those started oxidizing, making those hydrogen bubbles. Some days after, the water was orange, indicated that the FeO has just dissolved in it. I found ...
3 votes
1 answer
29 views

Clean a filler machine used to dispense epoxy resin

I am dispensing epoxy resin and at times epoxy hardener through a filler machine. It needs to be cleaned after each run, but rather than do a complete tear down, I'd rather be able to complete a &...
1 vote
1 answer
42 views

What factors influence the upper size limit of micelle's?

Is there an inherent size at which micelle's cannot grow larger in volume? I have been trying to find a quantifiable method of measuring a size limit with all the variables that affect micelle ...
9 votes
1 answer
580 views

What is the maximum osmotic pressure that can be exerted with water as the solvent at room temperature?

Lets say we have a membrane which separates a tank of pure water from a tank of water saturated with a solute(there are also undissolved chunks of solute which can immediately dissolve if water is ...
  • 221
0 votes
0 answers
92 views

How do I keep my homemade liquid fabric softener from separating?

I have a recipe for a homemade liquid fabric softener that smells good and works great, but I have to shake it every time before I use it. It gets old fast. The recipe calls for: 12 cups hot water, ...
1 vote
1 answer
85 views

Difference between the specific heat capacity of potassium chloride solution and sodium chloride solution

I am curious about the difference between the specific heat capacity of a potassium chloride solution (KCl + water) and a sodium chloride solution (NaCl + water) - particularly the specific heat ...
's user avatar
1 vote
1 answer
78 views

Reaction of long-term stored zinc acetate dihydrate

I was investigating solubility of zinc acetate dihydrate for various organic solvents, and for this I took out zinc acetate dihydrate in my lab containor. When I opened it very big aggregation was ...
  • 837
1 vote
1 answer
47 views

What is the effect of adding another solute to the solubility of the initial solute?

Let's say we have a saturated salt solution with 35 g/100 mL NaCl in water. If we add another solute up to its saturation concentration, for example 182 g/100 ml sucrose (C12H22O11), what happens? ...
1 vote
1 answer
83 views

Why don't universal indicator solutions react with themselves?

Universal indicator is a pH indicator made of a solution of water, 1-propanol, phenolphthalein, sodium hydroxide, methyl red, bromothymol blue, sodium bisulfite, and thymol blue that exhibits ...
  • 129
0 votes
1 answer
39 views

Simple bistable and reversible electrochromic reaction in solution

I'm not a chemist and I'm looking for a simple bistable and reversible electrochemical reaction that changes color, specifically: A liquid in a glass with two electrodes that when a voltage is ...
  • 11
4 votes
0 answers
83 views

Why is there a large increase in volume when an alkali metal is dissolved in liquid ammonia?

My teacher said unexplainedly that when alkali metals dissolves in liquid ammonia, there is a large increase in the volume. I found a paper that confirms this fact [1]: In the course of recent ...
  • 156
1 vote
1 answer
67 views

Finding final volume of the diluted solution with defined mass concentration given initial molar concentration

To what volume should you dilute $\pu{126 mL}$ of an $\pu{8.15 M}$ $\ce{CuCl2}$ solution so that $\pu{49.5 mL}$ of the diluted solution contains $\pu{4.56 g}$ $\ce{CuCl2}?$ I know you need to use $...
  • 71
0 votes
1 answer
113 views

Is acetone an effective solvent for bitumen?

Japanning is an age old process of protecting metal surfaces by applying several successive layers of a syrup-like black coating and then baking it to a hard and durable finish. It was often applied ...
0 votes
0 answers
14 views

Which single parameter can tell about the absolute as well as relative position of a solvent wrt a specific polymer in Hansen Space?

I am trying to represent solutions of a specific polymer (let's say PVDF) dissolved in various solvents using a single parameter. By various solvents I mean single solvent (e.g. DMF) or solvent blends ...
0 votes
0 answers
59 views

Can titanium dioxide oxidize sulfite

Suppose that there is 100mL of a 1M SO2 solution in water. If 1g of TiO2 photocatalyst is dispersed throughout the solution and UV light is shined on it, would it cause significant amounts of the ...
0 votes
1 answer
102 views

Balancing a chemical reaction with oxidation numbers

We have been teached how to balance chemical reactions with oxidation numbers in school, but somehow I can't understand it. This is the equation to balance $$\ce{Cu(s) + NO3−(aq) + H+(aq) -> Cu^2+(...
  • 9
0 votes
1 answer
158 views

How does one obtain a CuCl2 (solid or in solution with water) from a solution with HCl

I have a solution of CuCl2 and with HCl, and I want to seperate CuCl2 from the HCl. I cannot boil or distill the solution, since I don't have a fume hood or access to a safe enough space outdoors. So ...
5 votes
2 answers
483 views

Name of particles in a suspension

What is the proper name given to the particles in a suspension? Suspensae perhaps? When these particles are brought out of suspension, and precipitate down to the bottom of the mixture, what is that ...
0 votes
0 answers
23 views

Solubility of multiple solutes and limits of solubility during freezing

I'm interested in modeling the freezing of solutions of water and I'm not really sure what happens in water after the solubility of a given material is reached. I know that as ice crystals form they ...
  • 217
1 vote
0 answers
44 views

Relative Humidity inside a thermally insulated chamber for a NACL solution

I ran an experiment, where I had to measure the relative humidity of a thermally insulated chamber containing NaCl solution. I have read from a few papers, that the relative humidity of a NaCl ...
  • 29
3 votes
1 answer
172 views

Cannabigerolic acid (CBGA) and cannabidiolic acid (CBDA): Solubility in ethanol

How much CBGA and CBDA can be dissolved in a given amount of ethanol at room temperature? I did a bit of research but could not find any source on solubility of these substances in ethanol. For ...
1 vote
0 answers
35 views

How to calculate pH resulting from dissolving a salt in water? [closed]

The main question is how to calculate the changes in pH after dissolving a salt in water. Suppose we dissolve 1 gram of magnesium carbonate (MgCO3) in 1 liter of Water. This will result in (...
  • 11
0 votes
1 answer
55 views

How to find the empirical formula from mass percentages of oxides [closed]

Say you've given an element X and it makes two oxides. The first oxide is $X_\mathrm{4}O_\mathrm{6}$ and the mass percentage of oxygen is 43.7%. In the second oxide, the mass percentage of X is 43.7%. ...
-3 votes
1 answer
55 views

Don't understand how to conduct a sugar/water solution experiment [closed]

I am helping my some with simple chemistry experiments by following a book on experiments. I don't understand how to conduct one experiment thought (please see pic, experiment 16). It says dissolve ...
-2 votes
2 answers
402 views

Why is my Povidone-Iodine 10% Solution losing it's color which disappeared, 2 tsp mixed with 6 oz distilled water, sitting out for 3 days? [closed]

I was directed to use this method of 2 tsp povidone mixed with 6 oz distilled water for mouth gargling, and also either using the mixed solution in a neti pot on the nose, or using the mixed solution ...
  • 1

1
2 3 4 5
19