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Degree of hardness in a water sample containing 111ppm of CaCl₂ is 100ppm

Mg⁺² and Ca⁺² ions can be detected and estimated in hard water by titrating with disodium salt of
EDTA using eriochrome black-T indicator

Green vitriol contains 5moles of H₂O coordinated with Fe⁺² ion

Sequestration is process of removing Ca²⁺ ions from hard water

answer is C.

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Detailed Solution

$DOH = \frac{w of salt x 10^{8}}{GMW of salt x w of water in grams}$

${[F e {(H_{2} O)}_{6}]}^{+ 2} {SO}_{4}^{2 -} H_{2} O$

we can see they are six water molecules.

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