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Thursday, July 15, 2010

Problem Solving: Molarity, Normality, Percent Solutions

PROBLEM SOLVING :

1. WRITE DOWN FORMULA.
2. SHOW COMPUTATIONS.
3. ENCLOSE ANSWERS IN BOXES.

ATOMIC WEIGHTS:

Na = 23 H = 1 S = 32
Cl= 35.5 O = 16

1. If you weigh 5 g NaCl solution and dissolve it in 1000 ml of diluent. ( 5 pts. each)

A. What is the Molarity?
B. What is the Normality?
C. What is the percent solution?

2. What is the Molarity of a 0.5 N H2SO4 solution? (5 pts.)
3. What is the dilution if you add 0.75 ml of serum to 3.0 ml of diluent? ( 5 pts.)
4. How would you prepare 1:20 serum dilution? (5 pts.)
5. How would you prepare a 0.5 % NaCl solution? (5 pts.)
6. You are asked to prepare 200 ml of the following standard concentrations from a 20 mg/dL standard stock solution: Tabulate volume of solute and solvent and also dilution. ( 5 pts. each)

A. 2 mg/dL C. 8 mg/dL
B. 4 mg/dL D. 10 mg/dL
E. 15 mg/dL

PARTIAL ANSWERS ARE FOUND IN THIS POST

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