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0.075 M potassium chloride solution is prepared by mixing 75.5 mL

by 영원파란 2019. 10. 21.

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0.075 M potassium chloride solution is prepared by mixing 75.5 mL

 

 

A 0.075 M potassium chloride solution is prepared by mixing 75.5 mL of a stock solution with 450 mL of water. What is the concentration of the stock solution?

 

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용액의 부피 = 75.5 mL + 450 mL 525.5 mL

 

 

0.075 M KCl 용액 525.5 mL에 들어있는 KCl의 몰수

= (0.075 mol/L) × 0.5255 L = 0.0394125 mol KCl

---> stock solution 75.5 mL에 들어있었던 KCl의 몰수

 

 

stock solution의 몰농도

= 0.0394125 mol / 0.0755 L

= 0.522 mol/L

 

 

: 0.52 M

 

 

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