KVPY 2019 SB SX Exam Previous Papers

Question : 44 of 120

Marks: +1, -0

Permanent hardness of water can be removed by

Solution:

Permanent hardness can be removed by – sodium hexametaphosphate.
Calgon process

Na_2[Na_4(PO_3)_6] + Ca^{2+} \ { ––––––▸}Na_2[Ca_2(PO_3)_6] + 4Na^{+}

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