The Kjeldahl procedure was used to analyze 256 L of a solution containing 37.9 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.033 6 M HCl, and the remaining acid required 6.34 mL of 0.010 M NaOH for complete titration. What is the weight percent of nitrogen in the protein?
Chemistry of Solutions Course Number: 202-NYB-05 Lecture no. 1 Date: Thursday, August 25, 2016 Professor: Nadia Schoonhoven Topics Covered: Solution composition: a short review of significant figures (students are graded for their use of significant figures, further abbreviated as “sig figs”); review of mass percent, the mole fraction, molarity, molality and parts per million (ppm). How to Count Sig Figs Do your best to memorize these as marks will be deducted if you use the incorrect number of sig figs in your calculations! Scenario no. 1: when a number doesn’t contain a decimal or any zeros, all of the digits count as sig figs. For example, 1234 has 4 sig figs. Scenario no. 2: when zeroes precede nonzero numbers, only the nonzero digits count as sig figs. For example, 0.01 has