Order Entry & ProcessingQuestion 89 of 100
How many mL of a 50% stock solution are needed to prepare 500 mL of a 10% solution?
a.100 mL
b.50 mL
c.250 mL
d.400 mL
Explanation
Using C1V1 = C2V2: 50% x V1 = 10% x 500 mL, so V1 = 5000 / 50 = 100 mL of stock, then qs to 500 mL with diluent. Answering 400 mL is the volume of diluent added, not the volume of stock solution required.
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