20 mL of 0.1 M is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to:

Question

20 mL of 0.1 M  is mixed with 40 mL of 0.05 M HCl. The pH of the mixture is nearest to:

Canvas Classes · Accepted Answer

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

Step 2 — Neutralisation:

All  is consumed  only  remains (2×10⁻³ mol)

Step 3 — pH of  solution (salt of weak base + strong acid):
Total volume = 60 mL

Answer: Option (3) — 5.2

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