Thursday, October 2, 2014

Answers to Problem Solving, Normality, Molarity and Percent Solutions

1. What is the Normality  of a 3.6 M Sulfuric acid solution given the molecular weights?( H=1, S=32, O-16)
    a. 1.8 N          b. 3.6N        c. 4.9 N              d. 7.2 N        e. NIL

2. How many grams of HCL is used to prepare 250 ml of a 4.8 solution of HCL? (H-1, Cl-35.5)
    a. 36  G          b. 36.5 g       c. 40 g             d. 43.8 g           e. NIL

3. What is the Molarity of a 2 .5 N solution of NaOH?
a.       1.50 mol/l                   c. 3.35  mol/l                e. NIL
b.      2.5 mol/l                      d. 4.5  mol/l

4. The molecular weight of  H3 PO4 is:
a. 48                            c. 98                            e. NIL
b. 58.5                         d. 98.1

5. How many grams of  NaCl are required to make 1,000 ml. of  0.3 M  solution?
a. 36.3                         c. 26.32                       e. NIL
b. 52.6                         d. 53

6. What is the Molar concentration of a 20 grm. Of NaOH diluted to 1 liter of distilled water?
a. 1 M                                                              c. 0.5 M                       e. NIL
b. 2 M                                                              d. 1.5 M

 7. What is the amount of CaCl2.H2O in grams is needed  to prepare 0.4 N solution of
Ca Cl2?
a. 8.8                                                              c. 16                            e. NIL
b. 4                                                                  d. 32

  8. One milligram is equal to:
a. 0.001 grm.                                                   c. 0.01 grm.                 e. NIL
b. 0.0001 grm.                                                 d. 0.1 grm.

 9. A 10 mgs. % solution contains:
a.       10 mgs of solute/100ml of solution
b.      10 mgs of solute/100 ml of diluent 
c.       10 mgs of solute/1000 ml of diluent
d.      10 mgs of solute/1000ml of solution
e.       NIL

10. A 2 % solution of 10mg/100ml is diluted 1:100. What is the final concentration?
a. 2 %                                                              c. 0.2 %                       e. NIL
b. 0.02 %                                                         d. 0.002 %

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