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Magnesium detection can use EDTA titrimetric method analysis. Because than aluminium magnesium alloy light, so it can be used in aviation, spaceflight. Another using magnesium oxide, to the nature can be used in the manufacture of many of pure metal reductant. Can also be used to flash, inspiratory, etc.
Determination of total hardness is water in calcium, magnesium ions, the total content available EDTA coordination titration:

Before the titration, EBT + M - EBT

(red),

The reaction: M + Y wish

End: M - EBT EBT + + Y wish

(red) (blue)

Titration to solution from red to blue, namely to finish.

Titration, Fe3 Al3 + +, such interference ion can be masking triethanolamine, Pb2 Cu2 +, Zn2 + +, weight of ion, usable KCN, Na2S mercaptoacetic acid or to cover.

Water hardness has a variety of methods, this experiment requirement to each liter Ca2 +, contained in Mg2 + amount (convert CaO said, the quality of mg, L - 1 unit.

Equipment and drugs

1 scales (0.1 g, equipment, RongLiangPing 0.1 mg) (100 ml), 20mL), acid pipette (DiDingGuan type 50mL (250mL), cone-shaped bottle (etc).

2 HC1 drugs (1:1) and ethylenediamine tetraacetate (2), 2H2O A.R., Na2H2Y, alkali type magnesium carbonate [Mg (OH) 2 · · 6H2O, 4MgCO3 benchmark reagent], NH3 - NH4Cl buffer solution (pH = 10.0), (1:1) triethanolamine, chromium black T indicator (0.2% of ammonia solution) etc. Ethanol,