Questions in Laboratory Mathematics

Determine the molecular weights of the following substances: Atomic weights: H=1, Na=23, Cl=35.5, S=32, O=16, Ca=40, N=14

1. NaCl                          
2. H₂SO₄
3. CaCl₂.H₂O
4. HCl
5. HNO₃

Choices:

            A. 36.5

            B. 58.5

            C. 63

            D. 98

            E. 129

F. 111

6. How many milliliters of 0.5 N hydrochloric acid is needed to prepare 250 milliliters of 0.1 N hydrochloric acid?

A. 50 milliliters

B. 200 milliliters

C. 20 milliliters

D. 60 milliliters

E. 25 milliliters

7. If you are to prepare 150 milliliters of normal saline solution, how much of the solute will you need?

A. 1.60 milliliters

B. 10 milliliters

C. 15 milliliters

D. 1.3 milliliters

E. 1.5 milliliters

8. How will you prepare a serum-NSS dilution of 1:25, if you have 0.50 milliliters of serum?

A. Add 0.50 milliliter of serum to 20 milliliters of normal saline solution.

B. Add 0.50 milliliters of serum to 25 milliliters of normal saline solution.

C. Add 0.50 milliliters of serum to 12 milliliters of normal saline solution.

E. Add 0.50 milliliters of serum to 24 milliliters of normal saline solution

9.  What is the weight of CaCl₂ needed to prepare 1 liter of 2 Molar solution?

A. 111 grams

B. 55.5 grams

C. 222 grams

D. 200 grams

E. 75 grams

10. What is the Normality of a 0.5% HCl solution?

A. 1.37

B. 1.80

C. 18.25

D. 10.85

E. 0.18

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