REAGENTS
4.—4.1 Hydrochloric acid, N solution (approximately).
4.2 Hydrochloric acid, 0.5 N solution.
4.3 Magnesium standard solution: dissolve 1.013 g magnesium sulphate (MgSO4.7H2O) in 0.5 N hydrochloric acid solution (4.2) and dilute to 100 ml with this acid.
1 ml of this solution contains 1 mg of magnesium (Mg).
or
weigh out 1.658 g of magnesium oxide, previously calcined at 600° for 2 hours, place in a beaker with 100 ml of water and 120 ml of approximately N hydrochloric acid (4.1). After dissolution, transfer quantitively into a one litre graduated flask, make up the volume with water and mix.
1 ml of this solution contains 1 mg of magnesium (Mg).
4.4 Strontium chloride solution: dissolve 15 g strontium chloride (SrCl2.6H2O) in 0.5 N hydrochloric acid solution (4.2) and dilute to 100 ml with the same solvent.