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A solution of H3PO4 in water has a concentration of 12% by massand has a density...

A solution of H3PO4 in water has a concentration of 12% by massand has a density of 1.04 g/mL. Calculate the pH

H3PO4-------H++H2PO4 KA=7.1*10-3

H2PO4--------H++HPO42- ka=6.3*10^-8

HPO42--------H++HPO42- la=4.2*10^-13

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