Answer to Question #93243 in General Chemistry for Jerson

Question

Commercial Vinegar is analyzed for percent acetic acid. Complete the table to complete the percent.

Preparation of Vinegar sample
Mass of Vinegar- 3.06g

Analysis of Vinegar
Initial Buret Reading- 3.70 ml
Final- 25.40 ml
Volume of NaOH Used- ?ml
Molar concentration of NaOH- ?mol
Moles of NaOH added- ?mol
Moles of CH3COOH IN VINEGAR- ?
Mass of CH3COOH IN VINEGAR- ?g
Percent by mass of CH3COOH-?

1.the percent of CH3COOH in vinegar is 5.01 percent and 4.66 respectively. What is the average percent of CH3COOH IN VINEGAR SAMPLE?

2. What are the standard deviation of and the relative standard deviation of for the percent CH3COOH in vinegar sample?

Answer 1

Volume of NaOH Used- 21,70ml

Molar concentration of NaOH- 0,12M

Moles of NaOH added- 2,5*10^-3 mol

Moles of CH3COOH IN VINEGAR- 2,5*10^-3 mol

Mass of CH3COOH IN VINEGAR- 0,15g

Percent by mass of CH3COOH - 4,84%

1) 4,84%

2)S=0,25

S_r=0,051