Trial I Trial 2 1. Mass of flask (g) 2. Mass of flask + vinegar (8) 3. Mass of vinegar (g) 93870 (.3ëë , 92 B. Analysis of Vinegar Sample 1. Buret reading of NaOHl, initial (mb) 2.7 32.2 2. Buret reading of NaOH, final (mL) 3. Volume of NaOH used (mL) 4. Molar concentration of NaOH (mol/L) 5. Moles of NaOH added (mol) 6. Moles of CH COOH in vinegar (mol) 7. Mass of CHCOOH in vinegar (g) 8. Percent by mass of CH3COOH in vinegar (%) 9. Average percent by mass of CH,COOH 3.0 in vinegar (96) *Calculations for Trial I of the first vinegar sample on next page.