Question:
What is the pH of the solution formed by mixing 40 mL of 0.1 M HCl with 10 mL of 0.45 N NaOH?
What is the pH of the solution formed by mixing 40 mL of 0.1 M HCl with 10 mL of 0.45 N NaOH?
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NaOH is in excess; find the leftover OH- concentration.
Updated On: Jul 3, 2026
- 2
- 6
- 10
- 12
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The Correct Option is D
Solution and Explanation
Step 1: mmol H+ = 0.1x40=4. mmol OH- = 0.45x10=4.5.
Step 2: Excess OH- = 0.5 mmol.
Step 3: Total volume 50mL. [OH-]=0.5/50=0.01M.
Step 4: pOH=2, pH=12.
\[\boxed{pH = 12}\]Was this answer helpful?
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