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Experiment 1: hardness of water by edta titration - calstatela

Experiment 1: hardness of water by edta titration - calstatela 2025

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The document outlines a laboratory experiment focused on determining water hardness through EDTA titration. It explains the concept of water hardness, primarily caused by calcium and magnesium ions, and details the chemical reactions involved in the titration process using EDTA as a complexing agent. The procedure includes preparing standard solutions, conducting titrations with indicators, and calculating the concentration of calcium carbonate in unknown samples. Additionally, it provides guidelines for ensuring accurate measurements and handling potential interferences during the experiment.

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What is EDTA method for determining hardness of water?

Water hardness can be measured using a procedure known as complexometric titration by adding a known concentration of the chelating agent EDTA through a burette to a sample containing an unknown amount of calcium and magnesium ions. EDTA reacts and captures these metal ions creating a larger metal complex.

Which is the best method for hardness determination and why?

The titration with EDTA is the most true method as it defines the parameter hardness. There is no need to use more advanced methods if the analytic question is just to find the hardness of the water.

How does EDTA determine the hardness of water?

Total hardness is measured by titrating the water sample with EDTA using an indicator. Temporary hardness is removed by boiling the sample and titrating the filtrate to obtain permanent hardness. By subtracting permanent hardness from total hardness, temporary hardness is calculated.

What happens when EDTA is added to hard water?

The hardness of water is estimated by simple titration of ethylene diamine tetraacetate (EDTA) solution. EDTA forms stable complexes with the metal ions present in the hard water since stability constants of calcium and magnesium complexes of EDTA are different, even the selective estimation of these ions is possible.

What is the color change of EDTA?

Indicators. Calmagite and Eriochrome BlackT (EBT) are such indicators that change from blue to pink when they complex with calcium or magnesium. The endpoint of a complexometric EDTA titration using either Calmagite or EBT as the indicator is detected as the colour changes from pink to blue.

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What is the EDTA method?

In the EDTA method water is titrated with ethylene diamine tetraacetic acid using Erichrome Black T (EBT) as an indicator. EBT forms wine red colour and titration changes the colour to blue.

What is the conclusion of the hardness of water lab report?

*Conclusion: Hardness is the property which makes water to form an insoluble precipitate with soap and is primarily due to the presence of calcium and magnesium ions. Hard waters have no known adverse health effects and may be more palatable than soft waters.

How do you determine the hardness of water by EDTA titration?

Hardness of water is determined by titrating with a standard solution of ethylene diamine tetra acetic acid (EDTA) which is a complexing agent. Since EDTA is insoluble in water, the disodium salt of EDTA is taken for this experiment. EDTA can form four or six coordination bonds with a metal ion.

Experiment 1: hardness of water by edta titration - calstatela 2025

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What is EDTA method for determining hardness of water?

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