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The $pK_a$ of a certain weak acid is $4.0.$ What should be the [salt] to [acid] ratio, if we have to prepare a buffer with a $pH=5$ using the acid and one of the salts?

\[(a)\;4:5 \qquad (b)\;5:4 \qquad (c)\;10:1 \qquad (d)\; 1:10 \]
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(c) 10:1
answered Nov 7, 2013 by pady_1

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