Solution of task 342 of Chemistry Book Shimanovich 2003

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342. What salts determine the rigidity of natural water? What kind of rigidity is called carbonate, not carbonate?
How can carbonate, non-carbonate hardness be eliminated? Write the equations of the corresponding reactions.
What is the rigidity of water, in 100 liters of which 14.632 g of magnesium hydrogen carbonate is contained?

Answer: 2 meq / liter.

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