Question

1) Chalkleys Amoeba Media- Calculate molarity

Nacl 0.1 g/l

KCl 0.004 g/l

CaCl2 0.006 g/l

2) A student is given 400 ml of a 3 M solution of NaCl and told to make 1,000 nl of a 0.5 M NaCl solution. How much H2O miust be added to how many ml of the original solution to arrive at exactly 1,000 ml of 0.5 M NaCl?

3) A 475 ml flask of 2 M NaCl is inadvertently left out on a hot plate over night by a careless student. When the flask is finally removed, its volume is only 125 ml. What is the molarity of the solution left in the flask?

4) 200 ml of a 0.5 M CaCl2 solution, 450 ml of a 3M CaCl2 solution and 750 ml of a 2 M CaCl solution are blended in a flask. To this 600 ml of H2 are added. What is the molarity of the final solution?

5) How many grams of K2HPO4 are required to make 350 ml of 0.5 M K2HPO4?

6) What is the molarity of a solution formed by adding 50 ml of 0.2 M NaCl to 100 ml of 0.1 M NaCl?