Solution of task 356 of Chemistry Book Shimanovich 2003

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356. Which ions should be removed from the natural water to make it soft? With which ions can water be softened?
Write the equations for the corresponding reactions. What mass of Ca (OH) 2 should be added to 2.5 liters of water in order to eliminate its hardness of 4.43 meq / liter?

Answer: 0.406

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