Equilibrium - Result Question 17

####18. For dibasic acid correct order is

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(a) Ka1<Ka2

(b) Ka1>Ka2

(c) Ka1=Ka2

(d) not certain

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Solution:

  1. (b) In polyprotic acids the loss of second proton occurs much less readily than the first. Usually the Ka values for successive loss of protons from these acids differ by at least a factor

of 103 i.e., Ka1>Ka2

H2XHHXKa1

HXHX2Ka2



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