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In order to prepare 100 mL of a 0.50 M sodium phosphate buffer, pH 7.9, how...

In order to prepare 100 mL of a 0.50 M sodium phosphate buffer, pH 7.9, how many grams of sodium phosphate monobasic must you add to your solution?

Use MW = 137.99 g/mol for sodium phosphate monobasic and pKa = 7.2 for sodium phosphate

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