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a weak acid (HA) has a pka of 2.77. assuming that the olumes are additive, calculate the volume in ml of .500 M HA , .5ooM NaA , and water required to make 250 ml of a buffer with a total concentration of .400 M and (a) ph=2.77, (b) ph=2.25 and (c) ph =3.00

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