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Question

What is the [H+] in 1M H3PO4 if
H3PO4H++H2PO4Ka1=104
H2PO4H++HPO24Ka2=109
HPO24H++PO34Ka3=1013

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Solution

H3PO4H++H2PO4Ka1=104H3PO4H++HPO24Ka2=109HPO24H++PO34Ka1=10131MH3PO4[H3PO4]=1M[H+]=?KO4=[H+][H3PO4]H3PO4Ka1=x.x1x104=x21x104=x21xx2=104104xx2+104x104=0x=1041084.1.1042=1041084×1042

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