A chemical supplier reports the concentration of stock alum chemical as<br>8.37 percent as Al2O3 with a specific gravity of 1.32. For the stock chemical,<br>calculate (a) the molarity of Al3+ and (b) the alum concentration if reported as<br>g/L Al2(SO4)3·14H2O. Also, for a 30-mg/L alum dose applied to a treatment<br>plant with a capacity of 43.2 ML/d (0.5 m3/s), calculate (c) the chemical<br>feed rate in L/min, (d) the alkalinity consumed (expressed as mg/L as<br>CaCO3), and (e) the amount of precipitate produced in mg/L and kg/d.
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