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When the difference in Ka1 and Ka2 values is over 10^3 you can ignore the second Ka and just use the one for ka1 but if its like ka1= 1*10^-2 and ka2=1*10^-3 then you have to use the second K value and can't ignore it. Hope this helps! It talks about this in the 6E chapter in the textbook
The book states that the second deprotonation will always occur, but so long as the provided Ka2 is less than about Ka1/1000 then the second deprotonation will be so small that it will not affect the pH significantly and can thus be ignored.
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