CHEM 297 Study Guide - Quiz Guide: Volumetric Flask, Potassium Thiocyanate, Silver Nitrate

• School: McGill University
• Department: Chemistry
• Course: CHEM 297
• Professor: Jan Hamier

Document Summary

Given that the random uncertainty of the analytical balance was + 0. 00005 g, Massnet = massinitial massfinal = 29. 4615 g - 27. 2099 g = 2. 2516 g 0. 00007. Mass of milk = 2. 2516 g + 0. 000031% Massagno3 = massinitial massfinal = 32. 3902 g - 23. 9048 g = 8. 4854 g + 0. 00007. [ agn o3]=mas s agno3 molar mas s agno3 . Given that the random uncertainty of the volumetric flask, the 25 ml pipette and the burette was + 0. 113 ml, + 0. 03 ml, and + 0. 1 ml respectively. Mean normality = (normality1 x normality2 x normality3)/3 = 0. 1175 n. Uncertainty of mass of chlorine in liters of milk. Mas schlorine=([ agn o3]volum eagno 3 [kscn ]volum ekscn) molar masschlorine=(0. 099905 0. 0500 0. 1185 34. 19) 35. 453=0. 03464 g. Percentage error for chlorine in milk: 29932+0. 0000312 1 /2=0. 2993. Given an average of 1. 872 g/l chlorine in milk, the error would be + 0. 0056 g/l. Then n=3, m=1. 872, and i refers to the trial.