Question

Sa se calculeze cantitatea de Mg cu 6%impuritati ce se consuma pentru a obtine 200 g solutie MgSO4 de concentratie 6%.

Answer 1

Concentratia = masa dizolvata × 100 / ms
md = ms×C/100= 200×6/100=12g MgSO4

24g.....................120g
Mg + H2SO4= MgSO4+ H2
xg............................12g

MMgSO4 =24+32+4×16=120 g/mol
x=24×12/120=0.24g Mg = m pur
mimpur = 0.24× 100/94 = 0.255 g Mg 94% pur