Questions for laboratory math in Clinical Chemistry

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.