12. Calculate the temporary, permanent and general hardness of water from the known mass of salts contained in 10 liters of water.
option 12
Mass of salt, g
Ca(HCO3)2 Mg(HCO3)2 Fe(HCO3)2 MgSO4 CaSO4 MgCl2
0.4 - - - 2.72 2.38
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