High School
SAT
ACT
University
MCAT
LSAT
DAT
Wize High School Grade 11 Chemistry Textbook > Solutions

Making Solutions

SolubilityPrevious Section
Acid Base DefinitionsNext Section
Popular Courses
Find My Course
0:00 / 0:00

Making Solutions

Making Standard Solutions

  • A standard or stock solution is a solution that we know the concentration of accurately. Stock or standard solution can be diluted.
  • To make a standard or stock solution, you have to dissolve the desired number of moles of solute in enough solvent to give the desired final volume of solution.


PAGE BREAK

Diluting Standard Solutions

  • We can reduce the concentration of a standard solution by adding more solvent to the solution

  • We can calculate the concentration of the diluted solution using the following equation:
c1V1=c2V2\boxed{c_1V_1=c_2V_2}
0:00 / 0:00

Example: Dilutions

Calculate the concentration of a diluted HCl solution prepared by taking 5.00mL of 1.50mol/L HCl and diluting it to 100.0mL in a volumetric flask.


c1V1=c2V2c_1V_1=c_2V_2
c2=c1V1V2=(1.50 M)(5.00 mL)(100.0 mL)c_2=\dfrac{c_1V_1}{V_2} = \dfrac{\left(1.50\ M\right)\left(5.00\ mL\right)}{\left(100.0\ mL\right)}
[HCℓ]=7.50×10−2mol/L[HC\ell]=7.50\times10^{-2}mol/L

Practice: Dilutions

During a dilution, the number of moles of solute:

Practice: Dilutions

What volume of 4.0mol/L HCl solution is needed to make 0.50L of 3.0mol/L HCl solution?

Practice: Making Solutions

Match the following changes to the effect they will have on the final concentration of the solution.
A.
doubling the original volume by adding water
B.
doubling the original volume by adding more of an identical solution
C.
doubling the number of moles by dissolving more solute
the concentration will halve
no effect on the final concentration
the concentration will double