Application of Statistical and mathematical equations in Chemistry Part 5 Strong Acids and Bases Ph theory Weak Acids and Weak Bases Salts of Weak Acids and Bases theory A buffer solution theory POLYPROTIC ACID IONIZATION

2. Chapter 5

4. Problem
•Example:
•Find the [OH-] in solution of 2*10-5M nitric
acid .

7. Problem
•Example:
•Find pH and pOH in solution of 0.5*10-4M
HCl and 1.5*10-3M NaOH respectively .

10. Problem
•Example:
•Find the pH and pOH for 2.56*10-4M NH3 .
•Kb for NH3 = 1.75*10-3.
•____________________________________
•Q5-5 Calculate the conc of H+ ions & OH- in
solution with pH=8.3

14. Problem
•Example:
•Find the pH in solution of 0.25M sodium acetate .
•Ka for CH3COOH = 1.75*10-5 .

18. Problem
•Example:
•Find the pH in solution of 15mL of 0.4M
CH3COOH and 25mL of 0.2M CH3COONa
. Ka for CH3COOH = 1.75*10-5

21. Problem
•Example:
•Find the percent of [HPO4
-2]/[H2PO4
-] in
solution has pH =7.6 .
•Ka2 for H3PO4 = 7.18*10-8

24. Problem
•Example: Find the [H3PO4] and [H2PO4
-] at
equilibrium in solution of 0.15M phosphoric
acid and [H+] = 1*10-4M at pH = 4 .
•Ka1 = 1.1*10-2 , Ka2 = 7.5*10-8 , Ka3 =
4.8*10-13

28. Problem
•Example:
•Find the [H+] for 0.2M NaH2Y knowing that
EDTA acid has four H+ proton (H4Y) . Ka2 =
2.2*10-3 , Ka3 = 6.9*10-7
•H2Y-2 H+ + HY-3
•H2Y-2 + H2O OH- +
HY-3