Hello folks
I am Dr. Avani Pareek and I welcome you all to my YouTube channel.

Hello folks
I am Dr. Avani Pareek and I welcome you all to my YouTube channel.

I post videos and content related to science. My videos are helpful for those who are preparing for JEE, NEET AND VARIOUS engineering treated exams.


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I post videos and content related to science. My videos are helpful for those who are preparing for JEE, NEET AND VARIOUS engineering treated exams.


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Today's topic include :Degrees of hardness and determination to hardness by EDTA method

Hardness of water

To study EDTA METHOD to determine hardness and degree of hardness link is

Degree of hardness l EDTA for hardness l complexometric merhod l engineering chemistry l Dr. Avani
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Removal of hardness by lime soda method

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To determine hardness by zeolite and ion exchange method

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Purification of water ( Municipal water supply)link is below

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To watch complete chapter corrosion click

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To watch complete chapter water

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   • Cement  

To watch complete chapter organic reaction for engineering chemistry click on

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EDTA (ethylene-diamine-tetraacetic acid) is a commonly used method for measuring the amount of hardness in water. The EDTA method works by chelating or binding to the calcium and magnesium ions present in the water, which allows them to be measured through a titration process.

Here are the basic steps involved in the EDTA method for measuring water hardness:

Collect a water sample and add a buffer solution to adjust the pH to around 10.

Add a few drops of indicator EBT is added in water solution. The color becomes wine red of solution as EBT forms unstable complexes with salts of cacium and magnesium.
now
Add titrate water solution with EDTA .The EDTA solution will bind to the calcium and magnesium ions in the water.
And when all salts react with EDTA then it will combine with salts of complex ( EBT- Ca +2)and EBT gets free at end point and color becomes black at end point


Slowly titrate a standard solution of a metal ion (usually zinc) into the water sample until the indicator changes color.

Calculate the hardness of the water sample in terms of calcium carbonate (CaCO3) equivalent, based on the amount of metal ion used in the titration.

The EDTA method is widely used because it is relatively simple, fast, and accurate. It can be used to measure total hardness (the sum of calcium and magnesium ions) or individual calcium and magnesium levels in water samples.
Dr. Avani pareek, Associate professor, JECRC