Question

acid based titrations
help with analysis of vinegar and sulfuric acid labs.

Name Section 1 Date 11-4-19 DATA SHEET: EXPERIMENT 16 A Determination of NaOH Concentration 1 Molarity of Il solution Trial #1 Trial 2 Trial #3 Volume of acid Final buret reading Initial buret reading 25.00m 25 Dome 13.90 ml 27.70 ml 0.00 m 13.90 mL 11. 10 mi 13.80 ml. 0.180m 0.145 m 5. Volume of NaOH 6. Molarity of NaOH (Show set-up) 410.00 0.080m -moto no 0.080m = x moles of HCL moles of NaoH 0.080x DO 1380x- mol HCL noles Concent, 1110 mL hadHX -MIXvlom²x v² 13.90 0.080 x 25,00 - 0.145 40.0 0.080x 25.00 (mx11.10) Hel.000 4.09 Nach 3545 7. Average molarity of NaOH 0.252 155 Daly 0.180 +0.145/2

Answer 1

The molarity of acetic acid is calculated:

M AA = Cb * Vb / Va = 0.252 M * 6.40 mL / 1 mL = 1.61 M

Trial 2: 1.76 M

Trial 3: 1.86 M

Average = 1.74 M

The mass percentage is calculated:

% m / m = 1.74 mol / L * (60.05 g / 1 mol) * (1 L / 1000 g) * 100 = 10.4%

The molarity of H2SO4 is calculated:

M = 0.252 M * 14.50 mL / 2 * 10 mL = 0.183 M

Trial 2: 0.171 M

Trial 3: 0.178 M

Average = 0.177 M

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