Amount of SeO2−3 is :
A water contains the following dissolved ions. [Na+]=56mg/L;[Ca2+]=40mg/L; [Mg2+]=30mg/L;[Al3+]=3mg/L; [HCO−3]=190mg/L;[Cl−]=165mg/L; Water pH is 7. Atomic weights: Ca=40,Mg=24,Al=27,H=1,C=12,O=16,Na=23,Cl=35.5 The non-carbonate hardness of the sample in mg/L as CaCO3 is
When 9.65 coulombs of electricity is passed through a solution of silver nitrate (atomic weight of Ag = 107.3, approximately 108) the amount of silver deposited is:
1g + 300 mg = ___.