lab10report

# lab10report - Carla Paulo Exercise 10 Potentiometric...

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Carla Paulo Exercise 10 Potentiometric Titration Purpose: To titrate a solution of sodium carbonate with hydrochloric acid and to determine the pH using potentiometric analysis and to determine the percentage of Na 2 CO 3 in unknown. Unknown #: 10C 40% Important Equations: CO 3 2- + H 2 0 HCO 3 - + OH - CO 3 2- + H 3 0 + HCO 3 - + H 2 O E = E’ – 2.303(RT/nF)log[H + ] 1 /[H + ] 2 Safety Factors: Gloves and goggles must always be worn. Use only deionized water for the experiment. Raw Data: A. Preparation of Unknown Beaker 1 Mass Vial Initial (g) 18.4993 Mass Vial Final (g) 18.0710 Total Mass (g) 0.4283 B. Titration Data d1= 33.65mL d2= 33.65mL Treatment of Results: 1. Percent of Na 2 CO 3 in the sample. 33.65mLx(1L/1000mL)x(0.100mol HCl/1L)x(1mol H 3 O + /2mol HCl)x (1mol CO 3 2- /1mol H 3 O + )x (1mol Na 2 CO 3 /1mol CO 3 2- )x(107.99g/1mol Na 2 CO 3 )= 0.1817g Na 2 CO 3 %Na 2 CO 3 = (0.1817g/0.4283g)x100= 42.42% 2. Describe how to obtain the second derivative. To obtain the second derivative, I used the first derivative of the second endpoint by

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## This note was uploaded on 12/07/2011 for the course CHEM 328 taught by Professor Soriaga during the Spring '10 term at Texas A&M.

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lab10report - Carla Paulo Exercise 10 Potentiometric...

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