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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42 views

What formula allows adjusting balance of (Ethyl Alcohol / Water / Caffeine powder) to know concentration for the Caffeine solution?

I am experimenting with different levels of concentrated caffeine solution. The solution has a small percentage of ethyl alcohol, in the $\ce{H2O}$. Problems encountered too much ethyl alcohol ...
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2answers
860 views

Simple question about mixing two electrolytes [closed]

Suppose we have two 0.1M solutions in water. What is their conductivity and how will it change when we mix them, and why? A) NaCl and KCl: Okay, so both are strong electrolytes and conduct well but ...
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1answer
72 views

Can hydrogen peroxide be oxygenated?

As per the heading, would peroxide be able to dissolve oxygen by whatever method, to have free oxygen and hydrogen peroxide mixed (under pressure?) similarly to $\ce{CO2}$ or $\ce{O2}$ in water? I ...
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2answers
3k 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 ...
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1answer
308 views

What is the stability of Pregnenolone in various mediums? [closed]

I have some pregnenolone powder that I want to dissolve it in to a liquid medium for later human ingestion, some potential medium choices would be: alcohol, fruit juice, water, olive oil. I am trying ...
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1answer
1k views

Calculating Boiling Point of solution

I wish to calculate the boiling point of the following solution. (w/w) 78.8% Glycerol, 11.6% Propylene Glycol, 8.3% Water, 1.2% Nicotine (molar fraction) 0.5790 Glycerol, 0.1037 Propylene Glycol, ...
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1answer
196 views

Why is the strong acid written in a net ionic equation? [closed]

Strong acids dissolve and break apart into ions, so in a net ionic equation, why are they written?
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1answer
3k views

Ions Na+ and Cl-

Fundamental question on ions: If, for instance, $\ce{Na}$ and $\ce{Cl}$ react to produce $\ce{NaCl}$ salt, then $\ce{Na^+}$ and $\ce{Cl^-}$ are obviously formed. What I don't understand is, for ...
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1answer
783 views

Are concentrated salt solutions stable over time?

I have to use dilute salt solutions incredibly frequently, and it takes valuable time to make them from pure reagents every time I need them. Are concentrated salt solutions fairly stable over time? ...
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2answers
75 views

Binding aqueous solution and oil solution without an emulsion

I am trying to solve this mystery...There is this company called 100% pure who makes lipsticks using fruit extracts as their pigments in their formulations. Fruits pigments are water soluble - so, the ...
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3answers
1k views

An aqueous solution of NaCl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution? [closed]

Work mole fraction of NaCl = 0.21/0.21+0.79 If there is 1 mol of total solution, there will be 0.21 mol NaCl and 0.79 mol H2O 0.21 mol NaCl = 12.27 g 0.79 mol H2O = 14.23 g this would yield a ...
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2answers
944 views

Difference between some terms relating to liquids

So my chemistry teacher, when she talks about liquid substances she talks about them in reference to 3 words. She refers to liquid substance with one of these 3 words- 1)Aquesous form 2)Solution ...
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3answers
7k views

Why can't a potassium sulfate anion KSO4(-) exist in solution?

Please explain to me why $\ce{KSO4^-}$ doesn't exist as a molecular ion in (aqueous) solution. I couldn't find a reason why. I assumed if you took one $\ce{SO4^{2-}}$ and one $\ce{K^+}$ ion, then ...
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1answer
42 views

Where do the electrons in lead–acid battery come from? [closed]

$$ \begin{align} \ce{PbO2 + H2SO4 &-> PbSO4 + H2O + O} &\quad &\text{(anode)}\\ \ce{Pb + H2SO4 &-> PbSO4 + H2} &\quad &\text{(cathode)} \end{align} $$ The cathode’s $\ce{...
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2answers
154 views

Can you dissolve iodine without potassium iodide? [closed]

I don't have a sufficient amount of potassium iodide, so I wanted to know if there is other way which I can use to dissolve iodine without using potassium iodide.
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1answer
2k views

Is it advisable to make vinegar at home using acetic acid?

I've taken only a couple university chemistry courses. In the lab, when we always used acetic acid in powdered form, it struck me how when buying vinegar in a bottle from the store, you must be paying ...
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1answer
48 views

Peroxide without hydrogen [closed]

How come we always see hydrogen peroxide and never peroxide by itself. Is there such a thing as peroxide ? Does this exist in nature? Why is hydrogen always associated with it? Please note: First ...
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1answer
39 views

Which type of deviation from Rault's law is shown by mixture of water and acetone? [closed]

There are dispersion forces in acetone amd hydrogen bond in water so what they should show negative deviation but just want it to be confirmed
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1answer
1k views

Does Ksp depend on the solvent?

E.g. would the solubility and Ksp of $\ce{Mg(OH)2}$ be the same in water as it would be in HCl? Doesn't solubility depend on the polarity of the solute and solvent, so wouldn't different amounts of a ...
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2answers
78 views

What do we call ions without basic and acidic properties

According to Brønsted theory, Acids are substances (molecules and ions) donating $\ce{H+}$ Bases are substances (molecules and ions) receiving $\ce{H+}$ I've been trying to find a complete Brønsted-...
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1answer
7k views

Van't Hoff Factor of Sucrose [closed]

What is the Van't Hoff factor for sucrose? According to me it should be 2 as sucrose is a disaccharide.
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1answer
147 views

Why do azeotropes boil at constant temperature? [closed]

As given in the Wikipedia page, An azeotrope (/əˈziːəˌtroʊp/) or a constant boiling point mixture is a mixture of two or more liquids whose proportions cannot be altered or changed by simple ...
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1answer
33 views

Solutions and Precipitates [closed]

If a solution of $\pu{20mL}$ of $\pu{ 0.050M}~\ce{K+ }$is added to $\pu{80mL}$ of $\pu{0.50M}\ce{ClO4-}$ will a precipitate form and what is the value of $Q_\mathrm{sp}$? For $\ce{KClO4}, K_\mathrm{...
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1answer
46 views

If I dissolve 0.1M of CaCl2.2H2O in water, do I get a 0.1M CaCl2 solution? [closed]

If I dissolve $\pu{0.1 M}$ of $\ce{CaCl2.2H2O}$ in water, do I get a $\pu{0.1 M}$ $\ce{CaCl2}$ solution?
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1answer
221 views

Solutions : Henry Law [closed]

In below solution why the moles are considered half as their is nothing clearly specified in question. I mean it is not given that that mole fraction we get is for litre water.
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2answers
1k views

Converting mass percentage of a solution into its density? [closed]

Is there a way of converting mass percentage of a solution to obtain its density? (With mass percentage been given and the compounds which are mixed to form the binary solution)
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1answer
580 views

Is blowing air (from lungs) into a water/soap solution changing the liquid into a gas contained in the bubbles?

I am teaching an art lesson to second graders. We are going to blow bubbles into a dyed soapy solution and then place the bubbles on paper. When the dyed bubbles pop, it makes for a great bubbly ...
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1answer
5k views

I have 6% weight by vol of hydrogen peroxide. How much water should i add to make it 3% [closed]

i read that to bleach hair we should use 3 percent hydrogen peroxide. the bottle i got is 100ml and says 6% w/v h2o2.so how much percentage of peroxide does it contain. how should i dilute it
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1answer
24 views

Hydrogen and Hydrogen ion

Is it correct that a hydrogen atom only has 1 electron and 1 proton since the atomic mass is 1? Also, is the hydrogen ion composed of a single proton and no electrons? In an ionization process we know ...
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1answer
81 views

looking for alternatives to lysol wipes (Alkyl C12-18 dimethyl benzyl ammonium chloride) [closed]

Lysol and other recommended disinfectants claiming virucidal properties have been basically impossible to find here for weeks. I did however, find a bottle of clorox all-purpose disinfecting cleaner ...
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1answer
33 views

Problem with determining the mass value of a soil sample for gravimetric calculations [closed]

I'm having some trouble with how to determine the representative mass value of a prepared soil sample for calculating its $\ce{Cl-}$ concentration in ppm (mg/kg). Recently I carried out a gravimetric ...
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1answer
593 views

Calculate the final molarity from 2 solutions [closed]

How do I calculate the final molarity when 70.0 mL of 3.0 M sodium chloride solution is added to 30.0 mL of a 1.00 M solution of sodium chloride>
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1answer
246 views

dilution of Calcium Hydroxide [closed]

I have a 30% solution of Calcium Hydroxide. I want to make a 1% solution. How would I go about doing this? I tried using C1 x V1 = C2 x V2
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1answer
349 views

Chemistry - Solutions

Please give me a few hints as to how I can approach this problem A mixture of two miscible volatile ideal liquids P and Q (obeying Raoult’s law) is kept in a vessel (molar ratio of P and Q in the ...
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1answer
23 views

A quickly evaporating degreaser that does not ruin plastics?

I was wondering if there is a quickly evaporating solution that effectivly removes fat from glasses, but does not ruin plastic or metal. That is any eyeglass frame material..
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1answer
224 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 $\frac{mol}{L}$ $...
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2answers
13k views

How to calculate the total concentration after mixing two solutions of differing dilutions?

If you mix $\pu{20 ml}$ of $\pu{3 M}$ sugar solution with $\pu{30 ml}$ of a $\pu{5 M}$ sugar solution, what solution do you end up with? What I did, \begin{align} \text{volume} &= \frac{\text{...
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1answer
85 views

Does water in air occur as liquid or as gas? [closed]

I've learned that in a gas, the solute has to be a gas a well. Is that always the case? How about water in air, is that liquid in a gas, or a gas in a gas?
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2answers
60 views

I am not able to get the exact definition of a solution [duplicate]

A substance which is in larger proportion by mass is called solvent and which is in lesser proportion is called solute. What if the volume of the substance with lesser mass is more. Will it still ...
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2answers
73 views

How would I separate a solution of sodium iodide and water in order to obtain the sodium [closed]

I am an amateur in this field of science and I am trying to separate a solution of Sodium Iodide and water. How would I separate the solution so I can obtain sodium?
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1answer
85 views

Radioactive decay of ions in solution [closed]

What happens when ionic salts in solution decays? For example, if I had a handful of Francium-223 Palmitate(Francium salt of palmitic acid) and I were to put it in solution, how would the francium ...
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1answer
39 views

Deviations from Raoult's Law [closed]

A solution of two compounds may be an ideal solution and follow Raoult's Law, or it may show a positive or negative deviation from Raoult's Law. How to predict that whether a solution of two given ...
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1answer
166 views

Can someone help me find the limting reagent? [closed]

Okay, so for home work i was given this problem. Suppose that 8.00g of CH4 reacts with 16.00g O2 to form CO2 and H2O, find the grams of CH4, H2o, and O2 left over Balanced Equation : CH4 + 2O2 = ...
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1answer
26 views

Can there be a compound which stops the pesticide from entering into the fruit or vegetable? [closed]

Can there be a compound which stops the pesticide from entering into the fruit or vegetable? For example, a solution which is sprayed before pesticides and somehow blocks pesticides from entering into ...
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1answer
58 views

Chemistry of making glass [closed]

To boil glass, the lime and sand mixture of potash was heated and the off gas spent $\pu{125 mL}$ of barley hydroxide solution (density $\pu{1.14 g mL-1}$). The mass of the sediment was $\pu{4.925 g}$....
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1answer
1k views

How can I convert weight percentage of calcium chloride hexahydrate to calcium chloride dihydrate? [closed]

I have a chemical formula with $27\%$ $\ce{CaCl2.6H2O}$ and $43\%$ water with the balance of $30\%$ being other chemicals. I want to convert the $\ce{CaCl2.6H2O}$ and water percentage to $\ce{CaCl2....
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2answers
370 views

How does a glow stick work [duplicate]

I understand that when the glow sticks snaps, it produces light, and that process is called triboluminescence. But I don't understand how that works
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1answer
105 views

What happens to depression when two solutions are mixed? [closed]

Equal volumes of $\pu{1.0 M}$ $\ce{KCl (aq)}$ and $\pu{1.0 M}$ $\ce{AgNO3 (aq)}$ solutions are mixed. The depression of freezing point of the resulting solution (with respect to water) will be (assume ...
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2answers
36 views

How does one dilute sulphuric acid (1.28sg@25ºc 460g/L) to 3 M Sulphuric Acid?

Thanks for looking. The extent of my research around the issue so far. SA sg table but wrong temp 60f not 77f/25c http://www.sschemical.com/wp-content/uploads/2013/05/Conversion_Table.pdf From ...
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1answer
727 views

Interpreting the phase diagram of a minimum boiling azeotrope

Exactly what does the line AB signify in the above phase diagram? Also, why is the curve divided at the azeotropic point?