Which of the following are TRUE about the pH changes? Select one: a. A pH change

ID: 570593 • Letter: W

Question

Which of the following are TRUE about the pH changes?

Select one:

a. A pH change from 3.0 to 5.0 reflects a decrease in the proton concentration ([H+]) by a factor of 100.

b. A pH change from 5.0 to 3.0 reflects an increase in the H+ ion concentration of 25 percent.

c. A pH change from 5.0 to 3.0 reflects a decrease in the H+ ion concentration of 25 percent.

d. A pH change from 3.0 to 5.0 reflects a greater proportional increase in the H+ ion concentration than a pH change from 5.0 to 7.0

f. (b) and (d) are correct

For pH equal to 3

pH = -log[H+]

[H+] = 10^(-3) = 0.001

For pH equal to 5

pH = -log[H+]

[H+] = 10^(-5) = 0.00001

For pH equal to 7

pH = -log[H+]

[H+] = 10^(-7) = 0.0000001

a) pH change from 3 to 5, decrease in concentration = 0.001/0.000001 = 100

Hence option A is correct

b) The statement is false, the increase in H+ concentration is more than 25 percent

c) Reducing the pH will increase the H+ concentration, hence this is also change

d) THe proportion remains the same

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