1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH. If a

ID: 945489 • Letter: 1

Question

1) The pOH of a solution is related to pH using the formula pOH = 14.00 pH.

If a solution has a pH of 7.74, what is the pOH at 25oC?

2) If an aqueous solution at 25oC has a hydroxide concentration equal to 0.000047M, what is the concentration of hydronium ion in the solution?

Report your answer in scienftic notation.

3) What is the pH of a 0.033M HNO3 solution?

4) What is the pH of a 0.046M KOH solution?

5) What is the pH of a 0.047M Mg(OH)2 solution?

HINT: What is the total concentration of hydroxide if 1 mol of magnium hydroxide yields 2 moles of hydroxide?

1) pOH = 14.00 pH = 14-7.74 = 6.26

2) [OH-]=0.000047
p[OH-]=-log[OH-]=4.33

3) [H+]=0.033
p[H+]=-log[H+]=1.48

4) [OH-]=0.046
p[OH-]=-log[OH-]=1.34
pH = 14.00 pOH = 14-1.34 = 12.66

5) [OH-]=0.047*2 = 0.094
p[OH-]=-log[OH-]=1.03
pH = 14.00 pOH = 14-1.03 = 12.97

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