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Strong base is dissolved in 635 mL of 0.600 M weak acid (?a=4.31×10−5) to make a...

Strong base is dissolved in 635 mL of 0.600 M weak acid (?a=4.31×10−5) to make a buffer with a pH of 4.20. Assume that the volume remains constant when the base is added. HA(aq)+OH−(aq)⟶H2O(l)+A−(aq) Calculate the p?a value of the acid and determine the number of moles of acid initially present.

p?a=

mol HA=

When the reaction is complete, what is the concentration ratio of conjugate base to acid?

[A−][HA]=

How many moles of strong base were initially added?

mol OH−=

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