The best indicator for titrating HCl with NH4OH is: _________?
Correct answer: A. methyl Orange
- A. methyl Orange
- B. litmus
- C. phenol red
- D. phenopthalein
Explanation
HCl is a strong acid and NH4OH is a weak base, so their equivalence point is acidic because NH4+ hydrolyses to produce H3O+. Methyl orange changes colour in the acidic range and is therefore suitable; phenolphthalein is the likely distractor because its alkaline transition range suits a strong-acid, strong-base titration less well here.
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Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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