BotanyKa1,Ka2 and Ka3 are the respective ionisation constants for the following reactions.H2 S ⇌ H++HS-HS-⇌ H++S2-H2 S ⇌2 H++S2-The correct relationship between Ka1,Ka2,Ka3 is 

Ka1,Ka2 and Ka3 are the respective ionisation constants for the following reactions.

H2 S  H++HS-

HS- H++S2-

H2 S 2 H++S2-

The correct relationship between Ka1,Ka2,Ka3 is 

  1. A

    Ka3=Ka1×Ka2

  2. B

    Ka3=Ka1+Ka2

  3. C

    Ka3=Ka1-Ka2

  4. D

    Ka3=Ka1/Ka2

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    Solution:

    For the reaction, H2 SH++HS-

    Ka1= H+HS-H2 S

    For the reaction, HS- H++S2-

    Ka2=H+S2-HS-

    When, the above two reactions are added, their equilibrium constants are multiplied, thus

    Ka3= H+2 S2-H2 S= Ka1×Ka2

    Hence, Ka3=Ka1×Ka2  

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