Let's see how many of us know end point colour change, Answers is given inside the link

Let's see how many of know the end point of clour change of four parameters of water testing.

Total Hardness

Calcium Hardness

Total alkalinity

Chloride

All four parameters end point colour change is given in below picture.

From left to right

Calcium Hardness

Chloride

Total Alkalinity

Total Hardness

Now you have to name the colour write in comment box my dear Environmentalists

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TOC analyser principle

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TDS- Total Dissolve Solid

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Standard Operating Procedure for the Measurement of Total Hardness

SOP For Total Hardness in Water and waste water EDTA Titrimetric method Purpose: The purpose of this protocol is to provide guidelines for analysis of Total Hardness in Water. Principle of method: EDTA and it's sodium salts from a chelated solution complex when added to a solution of certain metal actions, if a small amount of dye such as Eriochrome Black T is added to an aqoeous solution containing calcium and magnesium ions at a pH of 10+0.1 to 10-0.1, the solution becomes winr red. When titrated with EDTA , the magnesium and calcium will be complexed, and when all of the and has been complexed the solution turns from wine red to Blue. To Instrument/Equipment: The following items are necessary to perform the analysis of Total Hardness in Water; pH Meter Burette – 50 ml capacity Glass Wares Reagents/Chemicals: All the chemicals should be of Analytical Reagent Grade. Distilled Water Buffer Solution – Dissolve 16.9 g of Ammonium Chloride...

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