Istandard hard water (containing 15gms of CaCO3 per 500 mL) required 25 mL of EDTA Solution for titration. 100 ml of water sample required 18 mL EDTA Solution, while same water after boiling required 12 mL EDTA solution. Calculate carbonate and non- carbonate hardness of water in ppm. Ans: Temporary hardness: 1440 ppm Permanent hardness: 2880 ppm Total hardness: 4320 ppm

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or  ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.