Question 48

[tjk447963]

I don't really understand why 2 pH units is equal to a 100 fold H+ concentration and not 10 fold.

For example, if the 2 pH units range is from pH 3 to pH 4 than the H+ concentration changes from 10^-3 to 10^-4 which is a 10 fold change in H+ concentration.

Am I going about this the wrong way?

[mcat_premed3832]

You gave the example of a pH range from 3 to 4:

4 - 3 = 1

That is a range of 1 unit so the exponent of 10 is 1 thus 10 fold.

A range of 2 units would be, for example, pH of 3 to 5:

5 - 3 = 2

This is a range of 2 units so the exponent of 10 is 2 thus 100 fold.

[dltkdgn896512]

I was thinking 2 pH in range of equivalence point
so it should be within -/+ 1 pH within equivalence point

if you do math 1 - (-1) = 2

RANGE of 2