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
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
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
25.
26.
27.
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