Questions for laboratory math in Clinical Chemistry
Instructions
• Read each question carefully before answering
• Follow the procedures of problem solving
o Determine the given
o What is asked? (unknown)
o Connect the given with the unknown using a formula
• Atomic weights:
o Na = 23
o Cl = 35.5
o Ca = 40
o H = 1
o O = 16
o S = 32
• Valences
o NaCl = 1
o H2SO4 = 2
o CaCl = 2
o HCl = 1
1. You have weighed 90 grams of sodium chloride (NaCl) in dissolved it to a total volume of 500 ml in a volumetric flask. Determine the following:
a. Percent solution
b. Normality
c. Molarity
2. If you were to prepare a total volume of 150 ml of the following stock solutions from a 50 mg/dL standard, how would you do it? Show volume of diluent and stock solution.
a. 40 mg/dL
b. 30 mg/dL
c. 20 m/dL
d. 10 mg/dL
ANSWERS WILL BE PUBLISHED NEXT WEEK.
