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99. Присутствие каких солей обусловливает жесткость природной воды? Как можно устранить карбонатную и некарбонатную жесткость воды? Рассчитайте сколько граммов Ca(НСO3)2 содержится в 1м3 воды, жесткость которой равна 3 мг-экв/л.
