... dissolve in water, acid and alkali, insoluble in alcohol, the aqueous solution is acidulous Uses:Used in the treatment of drinking water ... .0050.0045Water insoluble matter %, max 0.200.10PH value 1% aqueous solution, min 3.03.3As %, max 0.00050.00008Heavy metals as ... .005Water insoluble matter %, max 0.15 0.10PH value 1% aqueous solution, min 3.0 3.15 As %, max 0.0005 0 ...