How To Know The Chemical Formula Of A Compound Chemistry of Wastewater – The 5 Stages of Chemical Analysis of Wastewater

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Chemistry of Wastewater – The 5 Stages of Chemical Analysis of Wastewater

To understand the chemistry of wastewater through titration it is necessary to identify certain types of impurities, especially metals and heavy metals. Such chemical analysis of wastewater is carried out in stages. In the paragraphs below I have explained what these stages are.

1. Titrant

EthyleneDiamineTetraAcetic acid (N-CH2-CH2N) commonly known as the short form – EDTA is a common titrant used during titration to understand the chemistry of wastewater. Some Ethylenediaminetetraacetic acid (H4y) when used as EDTA proves to be less soluble while the Tetraneutralized solution (Na4Y) provides a very alkaline solution as it is easily hydrolyzed. Therefore Hexadentate (Na2H2y), which is a salt of EDTA, is used as a titrant. It is obtained as the dehydrate of Tetraacetic acid. Disodium salt known as Ethylenedinitrilo represented by the formula C10H14O8N2Na2.2H2O.

The chemical composition of EDTA is HOOC.H2C -> CH2COOH with any divalents Mg or Ca. This is a chelated compound.

2. Index

It changes color to indicate completion of chelation with EDTA. When using the process mentioned above, at a pH of 10.0 + 0.1, either Mg or Ca reacts with the indicator. This reaction causes the solution to change to a wine red color. If the solution already contains Mg and Ca, and if EDTA is added, it forms a very stable EDTA chelate compound. During this reaction the EDTA consumes all the Mg and Ca, which leads to the solution turning blue, as free indicators are released giving a good indication of the chemistry of the wastewater. Given below are two possible reactions:

H2R + Ca^++ (blue) -> CaR + 2H^+ (wine red)

CaR + Na2H2y (EDTA salt) -> CaNa2y + H2R (Chelate – Blue)

3. A definite conclusion

To bring the test to a positive final point, Mg ions must be present in the buffer. Therefore to achieve this, a small amount of Mg salt (EDTA) is added. This salt is complexometrically neutral. As the pH of this buffer solution increases, it leads to a sharper end. But the byproduct of this increased pH is the precipitation of either Mg(OH)2 or Calcium Carbonate (CaCO3). If the pH continues to rise further then an orange-yellow dye is obtained.

4. Precipitation of CaCO3

If the titration process is allowed to run for too long it will cause CaCO3 to precipitate. So all steps must be completed within five minutes. Dilution of the solution can reduce the concentration of CaCO3, so it must be diluted before the reagents are added to complete the titration.

5. Titration

Titrations are performed to understand the chemistry of wastewater. But the indicators used in the titration are affected by hot water. So it should always be done at room temperature.

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