2. Calculate the mass of hydrochloric acid required to convert carbonate hardness to non-carbonate hardness, if the total water hardness is 11.8 mmol-eq / dm3, the constant hardness is 4.3 mmol-eq / dm3. Mass fraction of hydrochloric acid - 34%, volume flow of water -50 m3. What will be the non-carbonate hardness after that?

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