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Question

Find the concentration of H+,HCO3 and CO23 in a 0.01M solution of carbonic acid if the pH of the solution is 4.18, K1=4.45×107,K2=4.69×1011.

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Solution

H2CO3H++HCO3
HCO3H++CO23
K1=[H+][HCO3][H2CO3]=4.45×107
K2=[H+][CO23][HCO3]=4.69×1011
As pH=4.18 so [H]+=6.61×105 and [H2CO3]=0.01M
On putting this value in eq(1) we will get [HCO3]=6.73×105
Similarly we get [CO23]=4.78×1011M
[H+]=6.61×105M,[HCO3]=6.73×105M,[CO23]=4.78×1011mol L1

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