The volume of water must be added to 100 mL of 0.5 M NaOH solution to get 0.2 M solution is

The volume of water must be added to 100 mL of 0.5 M NaOH solution to get 0.2 M solution is

  1. A
    50 mL 
  2. B
    100 mL           
  3. C
    150 mL
  4. D
    200 mL

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    Solution:

    Solution - I  (Initial or before dilution)                                                                 

    Solution – II (Final after dilution)

    Volume of  NaOH solution=V1=100 mL                        

    Volume of NaOH =V2

    Molarity,M1=0.5 M                                                      

    Molarity,M2=0.2 M

    According to Dilution Law,

            M1V1=M2V2

    The final volume of NaOH is

    V2=M1V1M2=0.5×1000.2=250mL

    Volume of water to be added =V2  V1

                                                 =250100

                                                  =150 mL

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