Question

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pH pOH Practice Problems 2

1. What is the pH of solution in which [H+] = 8.7 x 10-4 M ?


2. What is the pH of solution in which [H+] = 2.5 x 10-7 M ?


3. What is the pOH of solution in which [OH-] = 9.6 x 10-2 M ?


4. What is the pH of solution in which [H+] = 0.0456 M ?


5. What is the pOH of solution in which [OH-] = 7.7 x 10-3 M ?


6.What is the pH of solution in which [H+] = 113.5 x 10-11 M ?

7. What is the pOH of a solution with a pH of 2.7 ?

8. What is the pH of a solution with a pOH of 3.3 ?

9. What is the pOH of solution in which [H+] = 4.7 x 10-4 M ?

10. What is the pH of solution in which [OH-] = 8.3 x 10-7 M ?

11. What is the pH of a 0.0079 M HNO3 strong acid solution?

12. What is the pH of a 2.2 x 10-8 M HCl solution?(HCl is a strong acid.)

13. What is the pH of a 0.0082 M HClO4 solution?(a strong acid)

14. What is the pH of a 4.7 x 10-5 molarity HI strong acid solution?

Answer 1

Calculation of pH from [H3O+]
What is the pH of stomach acid, a solution of HCl with a hydronium ion concentration of 1.2 × 10−3M?

Solution







(The use of logarithms is explained in Appendix B. Recall that, as we have done here, when taking the log of a value, keep as many decimal places in the result as there are significant figures in the value.)

Check Your Learning
Water exposed to air contains carbonic acid, H2CO3, due to the reaction between carbon dioxide and water:



Air-saturated water has a hydronium ion concentration caused by the dissolved CO2 of 2.0 × 10−6M, about 20-times larger than that of pure water. Calculate the pH of the solution at 25 °C.

Answer:

5.70

Example 2

Calculation of Hydronium Ion Concentration from pH
Calculate the hydronium ion concentration of blood, the pH of which is 7.3 (slightly alkaline).

Solution









(On a calculator take the antilog, or the “inverse” log, of −7.3, or calculate 10−7.3.)

Check Your Learning
Calculate the hydronium ion concentration of a solution with a pH of −1.07.

Answer:

12 M