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Q. Name of the reagent required for determination of hardness of water sample of complex metric method. Briefly give the function of each reagent used.
Ans. Reagents required for determination of hardness of water sample by complex metric method:
(1) Standard water sample: To determine the strength of unknown EDTA solution.
(2) EDTA solution: It is a strong complexing agent. It acts as a tetra dentate or hexa dentate legend and binds with metal ions to give colourless and very stable chelate.
(3) Buffer solution of pH-10: It is prepared by mixing 67.5 ml of NH4Cl and 570 ml of concentrated ammonia and make up to one Litre with distilled water. It maintains the pH-10 Erichrome black-T work at pH-10.
Indicator solution (Erichrome black-T): It has two ionisable phenol hydrogen atoms. It gives wine red coloured unstable complex with Ca+2 and Mg+2 ions of hard water.
working of electrolysis process? components of electrolysis process? advantages and disadvantages of electrolysis process?
Why does NO2 dimerise? a) Give an example of linkage isomerism. b) A solution of KOH hydrolyses CH3CH2CH2CH2Cl and CH3CH2CH2Cl. Which one of these is more easily hydrolysed?
Break point chlorination: It may be defined as the chlorination of water to such an extent that not only living organism but also other organic impurities in water are destroyed.
what is the easy wet test of copper?
calculate the molarity of sodiun in 0.66ml water
Number of orbitats in h sub-shell is: (1) 11 (2) 15 (3) 17 (4) 19 Ans: 11
Molecular weight of orthophosphoric acid is M. Its equivalent weight is
Chemical reactions of glycerol.
what is agar-agar
Q. What happens to the energy values of d- orbitals? Let us see what happens to the energy values of d- orbitals under these stages. We start with the energy level diagram of a
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