For polyprotic acids ka1 is greater than ka2 , for polyprotic acid each proton dissociation not be looked seperately and ka values must be consider to determine ph.
Polyprotic acid defined as the substance capable of donating more than one protons.
Diprotic and Triprotic are specific types of polyprotic acid capable of donating two and three protons, respectively.
Dissociation constant tells us about solution’s acidity. The greater the dissociation constant, the more elevated would be its acidity.
Each proton dissociation can not be look separately for polyprotic acid
For most polyprotic acids all ka value must be consider to determine the ph of solution.
Larger ka lesser will be the ph.
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