help on lab chemistry 1

CHM201 General Chemistry and Laboratory I

Laboratory 5 – Acetic Acid Concentration in Vinegar

October 27, 2021

Name

Group

PLEASE ENABLE EDITING BEFORE FILLING OUT THIS REPORT!

Report Due by November 21, 2021.

No report will be accepted for credit after November 28, 2021

Grade:

Lab average to date:

Overall average to date:

Results (Sodium Hydroxide Standardization – successful trials only) (35 points)

NOTE: KHP contains no phosphorous. Its formula is given in the laboratory directions along with its molar mass.

KHP Titrations	1	2
Mass of KHP
Moles of KHP
Initial Volume Vo
Final Volume Vf
Volume required (Vf - Vo)
Molarity of NaOH
Average Molarity of NaOH

Results (Acetic Acid Content of Vinegar – successful trials only) (35 points)

Use the follwing value, determined by all students performing the lab, to complete the table below:

Class Average Molarity for NaOH (excluding outliers): 0.2536M

Vinegar Titrations	1	2
Volume of Vinegar
Moles of Acetic Acid in Vinegar (calculated)
Initial Volume Vo
Final Volume Vf
Volume required (Vf - Vo)
Molarity of Acetic Acid in Vinegar
Average Molarity of Acetic Acid
Measured % Acetic Acid in vinegar sample
% error (As described in the directions)

Questions

1. Show or explain your calculation for determining Measured % Acetic Acid in vinegar sample. You may incorporate a scan of your handwritten calculations if you prefer. (20 points)

2. If you or one of your laboratory partners misread the procedure and added 100 mL of distilled water to the solid KHP rather than 50 mL of water (Procedure 1.5), how would this affect the concentration of sodium hydroxide solution that you measured? Explain briefly . (10 points)