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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questions
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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
192 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
455 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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votes
1answer
4k 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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0answers
27 views
Question on Henry's law, Carbon dioxide in soda can [closed]
Solubility of CO2 at 20 degree Celsius and 1 atm is equivalent to 87.8 mL/ 100 mL water.
Suppose the partial pressure of CO2 before opening a can of coke was 2.5 atm, calculate the molarity of CO2 in ...
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votes
1answer
23 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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0answers
19 views
How do I make a stock solution concentrate from a pure solution? [closed]
We need to figure out how to make a stock solution that can be poured into 25mL capsules that can then be diluted onwards to 5% solution diluted with 200 mL of water.
We are starting with two pure ...
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0answers
21 views
How many liters of 4 M solution can be made using 100 grams of lithium bromide? [closed]
I am solving for molarity in my chemistry class and am getting two different answers. Question: How many liters of 4 M solution can be made using 100 grams of lithium bromide?
Method 1: (1 L/4 mol)(...
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votes
1answer
27 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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votes
1answer
77 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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votes
1answer
349 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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votes
1answer
212 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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votes
1answer
311 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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votes
1answer
22 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
165 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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votes
1answer
50 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
57 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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votes
2answers
46 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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votes
1answer
54 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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votes
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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votes
1answer
57 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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votes
2answers
340 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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0answers
27 views
Calculating change in enthalpy [closed]
I’ve got an assignment to solve this problem:
Calculate the change in Enthalpy when 50cm3 if 0.2moldm-3 NaOH is added to 250cm3 of HCl. The initial temperature is 21.6C and it rose to 32.8C.
I tried ...
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1answer
651 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?
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2answers
2k 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 ...
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0answers
22 views
Physical Chemistry Question [closed]
True or false?
a. The product of $\ce{[H3O+]}$ and $\ce{[OH-]}$ molalities in water at 25°C and 1 bar is always $\pu{1.0\times10^{-14} mol^2kg^{-2}}$
b. For the weak acid HX(aq), $\gamma_+ \gamma_- =...
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votes
1answer
1k views
Ksp of calcium hydroxide [closed]
What would the Ksp of calcium hydroxide be at around room temp (66 Fahrenheit) and 1 atm of pressure? I know the Ksp value varies with temperature, but is there a notable difference from 20 degrees C ...
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votes
1answer
437 views
what is the final concentration of the mixture [closed]
In a bizarre twist of chemical fate, an accident results in you results in you mixing 2L of a 3.00M solution of NaCl with 4L of a 1.50M solution of NaCl. what is the final concentration of the mixture?...
