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Riddhi Reddy
Asked: 2022-11-09T21:00:43+05:30 In:

Which of the following should be done in order to prepare 0.40 M NaCl starting with 100ml of 0.30M NaCl (mol. wt. of NACl – 58.5)
A. Add 0.585 g NaCl
B. Add 20 ml water
C. Add 0.010ml NaCl
D. Evaporate 10ml water

Which of the following should be done in order to prepare 0.40 M NaCl starting with 100ml of 0.30M NaCl (mol. wt. of NACl – 58.5)
A. Add 0.585 g NaCl
B. Add 20 ml water
C. Add 0.010ml NaCl
D. Evaporate 10ml water
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1 Answer

  1. Correct Answer – A
    100 ml. of `0.30 M =(100xx0.3)/(1000)=0.03` mole of NaCl
    100 ml of `0.40 M =(100xx0.4)/(1000)=0.04` mole of NaCl
    Moles of NaCl to be added = 0.04-0.03 =0.01 mole
    = 0.585 gm

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