Order Entry & ProcessingCâu 89 / 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
Giải thích
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.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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