What ph of a solution containing 42.1 g of na3po4

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Problem- Acetic acid has a Ka of 1.8x10^-5. Find [H3O+], [OH-], pH, and pOH for a 0.780 M acetic acid solution.

The Uses of sodium phosphate include clarifying crude sugar, manufacturing paper, removing boiler scale, and washing concrete.

1) What pH of a solution containing 42.1 g of Na3PO4 per liter?

2) What is [OH-] of this solution? Ka3 for H3PO4 is 4.2x10^-13.

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