1% w/v 용액 250 mL 제조에 필요한 12.5 %w/v 용액의 부피

1% w/v 용액 250 mL 제조에 필요한 12.5 %w/v 용액의 부피

 

 

Using the ratio equation, C1V1=C2V2, calculate what volume of sample would be pipetted into the making-up vessel if the pharmacist had a 250 mL volumetric flask, and a starting stock solution of 12.5 %w/v sodium chloride but needed to prepare a 1% w/v solution for further use in making isotonic solutions?

(A) 10 mL

(B) 20 mL

(C) 40 mL

(D) 60 mL

(E) 100 mL

 

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C1V1=C2V2

( 참고 https://ywpop.tistory.com/2859 )

 

(12.5%) (? mL) = (1%) (250 mL)

 

? = 1 × 250 / 12.5 = 20 mL

 

 

 

답: (B) 20 mL

 

 

 

 

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