Podcast
Questions and Answers
Which reagent is used to titrate the Ca$^{2+}$ and Mg$^{2+}$ ions in the water sample?
Which reagent is used to titrate the Ca$^{2+}$ and Mg$^{2+}$ ions in the water sample?
- Buffer solution of pH 10
- Eriochrome Black-T indicator
- EDTA solution (correct)
- Standard hard water solution
What is the purpose of using Eriochrome Black-T indicator in the experiment?
What is the purpose of using Eriochrome Black-T indicator in the experiment?
- To determine the pH of the unknown water sample
- To enhance the clarity of the titration endpoint
- To neutralize the standard hard water solution
- To produce a wine-red colored unstable complex with Ca$^{2+}$ and Mg$^{2+}$ ions (correct)
At what pH is the titration of Ca$^{2+}$ and Mg$^{2+}$ ions carried out?
At what pH is the titration of Ca$^{2+}$ and Mg$^{2+}$ ions carried out?
- pH 10 (correct)
- pH 14
- pH 7
- pH 4
What is the purpose of using Eriochrome Black-T indicator in the experiment?
What is the purpose of using Eriochrome Black-T indicator in the experiment?
What color complex is formed when Eriochrome Black-T is added to the hard water at pH 10?
What color complex is formed when Eriochrome Black-T is added to the hard water at pH 10?
At what pH is the titration of Ca$^{2+}$ and Mg$^{2+}$ ions carried out?
At what pH is the titration of Ca$^{2+}$ and Mg$^{2+}$ ions carried out?
Which reagent is used to titrate the Ca$^{2+}$ and Mg$^{2+}$ ions in the water sample?
Which reagent is used to titrate the Ca$^{2+}$ and Mg$^{2+}$ ions in the water sample?
What color complex is formed when Eriochrome Black-T is added to the hard water at pH 10?
What color complex is formed when Eriochrome Black-T is added to the hard water at pH 10?
Study Notes
Hard Water Analysis
- EDTA is used to titrate the Ca$^{2+}$ and Mg$^{2+}$ ions in a water sample.
- Eriochrome Black-T is used as an indicator in the titration.
- The titration of Ca$^{2+}$ and Mg$^{2+}$ ions is ideally carried out at a pH of 10.
- Eriochrome Black-T forms a wine-red complex with Mg$^{2+}$ ions when added to hard water at pH 10.
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Description
Test your knowledge of complexometric titration and the estimation of total hardness in water samples. Identify reagents and apparatus used, as well as the theory and reactions involved in the experiment.
