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1.) If a buffer solution is 0.5 M in a weak acid (pKa=6.86 ) and 0.5 M in its conjugate base, what is the pH?

1.) If a buffer solution is 0.5 M in a weak acid (pKa=6.86 ) and 0.5 M in its conjugate base, what is the pH?

2.)

Make up 0.1 M solutions (100 ml) of Na2HPO4 (FW=141.96) using a 100 ml volumetric flask.

How many grams of Na2HPO4 are needed to prepare this solution?

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