Vinegar Concentration Calculation: % HC2H3O2 in a Diluted Solution

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SUMMARY

The discussion focuses on calculating the percentage concentration of acetic acid (HC2H3O2) in a diluted vinegar solution after titration with a 0.1120 M NaOH solution. The student diluted 20.00 mL of vinegar to 500.0 mL and used 27.98 mL of NaOH to reach the endpoint. The key equation utilized is M1V1 = M2V2, which relates the molarity and volume of the solutions before and after dilution. To find the mass percentage, the density of the vinegar must be considered, even if not explicitly provided in the problem.

PREREQUISITES
  • Understanding of titration techniques and calculations
  • Familiarity with molarity and dilution equations (M1V1 = M2V2)
  • Knowledge of acetic acid and its properties
  • Basic principles of density and its role in concentration calculations
NEXT STEPS
  • Research how to calculate mass percentage from molarity and density
  • Learn about the properties of acetic acid and its behavior in solution
  • Study the concept of titration curves and endpoint determination
  • Explore the impact of dilution on solution concentration and calculations
USEFUL FOR

Chemistry students, laboratory technicians, and educators involved in analytical chemistry and titration methods will benefit from this discussion.

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Homework Statement


After diluting 20.00mL of vinegar sample to 500.0 mL in a volumetric flask, a student titrated a 20.00 mL aliquot of this diluted solution against a 0.1120 M NaOH solution. The acetic acid requires 27.98 mL of base. What is the % HC2H3O2 in vinegar?

Homework Equations


M1V1 = M2V2

The Attempt at a Solution


I tried to find the concentration of vinegar when it is added to base. So M1(20.00mL) = (0.1120 M NaOH)(27.98 mL). But I have no idea how I am supposed to find the mass %. Do I have to apply the formula to get to the M before its dilution and then use the density of vinegar? (Even though the density is not mentioned in the problem?).
Thanks
 
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asadpasat said:
M1V1 = M2V2

You do know where this equation comes from (and when it will fail)?

http://www.titrations.info/titration-calculation

And yes, you should know the density of the initial solution. You may initially assume it is just that of a pure water (actually it is a bit higher, but not much).
 

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