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In the EDTA titration of hard water using ammonia buffer (pH about 10) and Eriochrome Black T, the colour change at the end point is:

  1. Awine red to blue
  2. Bcolourless to pink
  3. Cyellow to red
  4. Dblue to wine red

Answer: A

EBT forms a wine-red complex with /. EDTA binds the metal ions more strongly and frees the indicator, which is blue at pH 10. The end point is therefore wine red to blue.
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