Question (1-2) Calculate the pH of the following solutions

1. [H+] = 3.45x10^-4 2. [OH-] = 5.39x10^-8

3. If [H+] =9.34x10^-5 then [OH-] =

4. Calculate the pH of 5x10^-3M HClO₄

5. Calculate the pH of .00046M Ca(OH)₂

6. Calculate the pH of a solution when 25.0mL of 0.15M HCl is mixed with 50.0mL of 0.25M HNO3

7. 25.0mL of 0.15M Ba(OH)₂ is mixed with 45.0mL of .20M HCl. What is the pH of the solution?

8. HOCl is an acid used as a bleaching agent. The Ka for HOCl is 3.2x10^-8,

A) Write the ionization equation for HOCl.

B) Calculate the [H+] of a 0.14M solution of HOCl.

C) Calculate the pH of the solution

9. Calculate the pH of .045M methylamine. kb = 4.38x10^-4

10. Calculate the pH of 0.0015M HF. Ka = 3.5x10^-4

11.Identify the following salt solutions as acidic, basic or neutral

NaCN, Fe(NO₃)₃, NH₄NO₃ Ba(OCl)₂

12. Calculate the pH of 0.10M NaC₂H₃O₂ Ka for acetic acid = 1.8x10^-5

13. Define a Bronsted acid and a Bronsted base

14. Define a Lewis acid and a Lewis base

15 .If Ka = 2.5x10-7 then Kb will = ______________

16. The pH of neutral water at 50° C will be

(a) 1 (b) 6.5 (c) 7.0 (d) 7.5 (e) 13

ANSWERS

(1) 3.46, (2)6.73, (3) 1.07x10^-10 , (4) 2.3, (5)11, (6) 0.66, (7) 1.7

8a) HOCl + H₂O <--> H₃O⁺ + OCl^-

8b) 6.7x10^-5M

8c) 4.2

9) 11.6,

10) 3.3

11) NaCN basic, Fe(NO₃)₂ acidic, NH₄NO₃ acidic, Ba(OCl)₂ basic

12) 8.9

15) 4x10^-8

16) b