Chemistry

Buffer solutions

Buffer solutions


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Example 3

An acetic acid / acetate buffer with excess acid [HAc] = 1.6 molL.-1 and [Ac] = 0,4 molL.-1 should as above with 0.1 molL.-1 NaOH are added. Of the pH-Value of the buffer is initially calculated according to:

pH=pKa+lg([Ac-][HAc])=4,75+lg(0,41,6)=4,15

After adding NaOH the following results:

pH=pKa+lg([Ac-]+[NaOH][HAc][NaOH])=4,75+lg(0,4+0,11,60,1)=4,25ΔpH=0,12

the pH-The change is more pronounced than with the 1: 1 buffer, so the buffer capacity is lower.


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