Question:
Which indicator is used for the determination of magnesium and calcium in complexometric titration:
Which indicator is used for the determination of magnesium and calcium in complexometric titration:
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EBT: Wine Red (Metal) $\rightarrow$ Blue (Free indicator at endpoint).
Updated On: May 15, 2026
- Methyl orange
- Eriochrome Black T
- Starch
- Phenolphthalein
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Complexometric titration often uses metal-ion indicators that change color when they bind to metal ions.
Step 2: Meaning
EDTA is commonly used to titrate divalent metal ions like $Ca^{2+}$ and $Mg^{2+}$.
Step 3: Analysis
Eriochrome Black T (EBT) forms a wine-red complex with $Mg^{2+}$ and turns blue at the endpoint when EDTA displaces the indicator.
Step 4: Conclusion
EBT is the standard indicator for determining water hardness and calcium/magnesium content. Final Answer: (B)
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