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1. pH is 4.66.

2. pH is 3.44.

3. pOH is 11.54.

Explanation:

1. Determination of the pH.

Concentration of Hydrogen ion, [H+] = 2.17×10^-5M

pH =..?

pH = –Log [H+]

pH = –Log 2.17×10^-5

pH = 4.66

2. Determination of the pH.

pOH = 10.56

pH =..?

pH + pOH = 14

pH + 10.56 = 14

Collect like terms:

pH = 14 – 10.56

pH = 3.44

3. Determination of the pOH.

Concentration of Hydrogen ion, [H+] = 3.48×10^-3M

pOH =..?

First, we shall determine the pH of the solution. This is illustrated below:

pH = –Log [H+]

pH = –Log 3.48×10^-3

pH = 2.46

Now, we can determine the pOH of the solution. This is illustrated below:

pH = 2.46

pOH =..?

pH + pOH = 14

2.46 + pOH = 14

Collect like terms

pOH = 14 – 2.46

pOH = 11.54