Q10(a). Metal-ion indicators and their requisites
What are the metal-ion indicators? Mention the requisites of a metal-ion indicator for use in the visual detection of end points.
Answer in brief
Metal-ion (metallochromic) indicators are organic dyes forming a coloured chelate with the metal; at the end point EDTA takes the metal from the indicator and the colour of free In appears.
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Coversmetal-ion indicatorsmetallochromic indicatorsEriochrome Black Tindicator blockingxylenol orange
All parts of Question 10
- 10(a) Metal-ion indicators and their requisites10 marks
- 10(b) Masking and demasking in EDTA titrations10 marks
- 10(c) Electronic configuration and magnetic moment of La³⁺, Gd³⁺, Lu³⁺10 marks