What is the final pH when 9.85 g of phosphoric acid (98.00 g/mol) and 5.09 g...

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What is the final pH when 9.85 g of phosphoric acid (98.00 g/mol) and 5.09 g of NaOH (40.00 g/mol) are added to 1 L of water.

K_a1 = 1.1 x 10^-2 K_a2 = 7.5 x 10^-8 K_a3= 4.3 x 10^-13

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