Cl gravimetric analysis

1. A 0.500 g sample is weighed out and dissolve in 0.5000 L. 25.00 mL of this is pipeted into an beaker and 35 mL of water added. It is then titrated and found to contain 0.005 g of Cl^-. What is the %Cl in the sample?

a) 100 b) 25 c) 20 d) 3.3 e) 45

2. How many moles of Cl^- are in a sample that weighs 0.410 g and is 100 % NaCl?

3. What is the % Cl in CaCl2?

4.  A student reports the % Cl in a sample is 45.67% with a relative error of 1.341 ppt.  Which of these numbers probably has the wrong number of significant figures and why do you say that?

Error Analysis.

P3.10

P3.14