Chemistry

Problem

A laboratory procedure calls for

1.50\,\text{L}

of an acetate buffer whose total acetate species concentration ([CH₃COOH] + [CH₃COO⁻]) is

0.30\,\text{M}

and whose pH is 4.46 (

pK_{a}

of acetic acid = 4.76). How many grams of sodium acetate trihydrate (NaCH₃COO·3H₂O, molar mass =

136\,\text{g mol}^{-1}

) must be weighed out? a)

14.1\,\text{g}

20.4\,\text{g}

40.8\,\text{g}

30.6\,\text{g}