3. The following pH values of a monobasic weak acid were measured:
C, mol/l 0.01 0.07 0.12 0.16 0.25 0.75 1.00
pH 3.8664 3.4440 3.3270 3.2640 3.1670 2.99 2.2999
Calculate the pH value of a 0.63 mol/L solution of this acid.
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