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What is the equilibrium concentration of PO4 in a 0.511 M solution of H3PO4 (Ka1 =...

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Chemistry

What is the equilibrium concentration of PO4 in a 0.511 M solutionof H3PO4 (Ka1 = 7.5E-3, ka2= 6.2E-8, ka3= 4.8E-13) I troes usingthe 5% rule but when i checked my work i was at 11%. I dont knowhow to solve this if i cant use the 5% rule. Help please.

Answer & Explanation Solved by verified expert
3.7 Ratings (610 Votes)
First We will use the relation pKa1 H2PO4H H3PO4 The important equilibrium reaction is H3PO4 H2O H3O H2PO4 Thus Ka1 H3OH2PO4H3PO4 75 x 103 Let    See Answer
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