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Question : 60 of 200
Marks:
+1 ,
-0
Solution:
V 1 ‌ = 75 ‌ mL , V 2 = 25 ‌ mL M 1 ‌ = 0.2 M , M 2 = 1 M V 3 ‌ = 300 ‌ mL , pH = ? V ‌ = V 1 + V 2 = 75 + 25 = 100 ‌ mL M ‌ = ‌ = ‌ = 0.4 M ∴ Total volume
V ′ = V 1 + V 2 + V 3 = 75 + 25 + 300 = 400 ‌ mL M V = M ′ V ′ 0.4 × 100 = M ′ × 400 M = 01 M Concentration of
HCl = 0.1 = 10 − 1 ∴ ‌ ‌ pH = − log 10 [ H + ] = 1
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