Solution to PS 1 #7

In this problem ascorbate is the basic form (A-) and ascorbic acid is the acid form (HA). The ratio, x, is [A-]/[HA].

So...

a) If x = 1, then pH=pKa=log1 means that pH=pKa=4.2

b) If x = 0.1, then pH= 4.2 + log(0.1); pH=4.2-1=3.2

c) If x = 10, then pH=4.2+ log(10); pH=4.2+1=5.2

d) If x=1/3=0.333; the pH=4.2+log(0.333)=4.2-0.5=3.7

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