20 mL of 0.1 M solution is added to 30 mL of 0.2 M solution. The pH of the resultant mixture is:

Question

20 mL of 0.1 M  solution is added to 30 mL of 0.2 M  solution. The pH of the resultant mixture is:

Canvas Classes · Accepted Answer

Step 1 — Moles of each:
Moles  =  mol  =  mol
Moles  =  mol

Step 2 — Neutralisation:

H⁺ consumed =  mol
 remaining =  mol
 formed =  mol

Step 3 — Buffer solution (weak base + its salt):
Total volume = 50 mL

Step 4 — pOH using Henderson-Hasselbalch for base:

Answer: Option (4) — 9.0

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