Ionic EquilibriumMedium
Question
Arrange the following resultant mixtures in increasing order of their pH values
| A. 10 mL 0.2 M Ca(OH)₂ + 25 mL 0.1 M HCl B. 10 mL 0.01 M H₂SO₄ + 10 mL 0.01 M Ca(OH)₂ C. 10 mL 0.1 M H₂SO₄ + 10 mL 0.1 M KOH |
|---|
Choose the correct answer from the options given below :
Options
A.B < C < A
B.C < A < B
C.C < B < A
D.A < C < B
Solution
Sol. 
an final solution, [OH⁻] = 1.5 mmol/35 ml = 1.5/35
pOH = −log(1.5/35)
pH = 14 + log(1.5/35)
(B) H⁺(aq) + OH⁻(aq) → H₂O(ℓ)
t = 0 0.2 mmol 0.2 mmol
final pH = 7
(C) H⁺(aq) + OH⁻(aq) → H₂O(ℓ)
t = 0 2 mmol 1 mmol
t = ∞ 1 mmol 0
Final pH < 7
So, order of pH values :
(C) < (B) < (A)
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