Question

Ce masa de Na se află in 120 g NaOH de puritate 75% vaaa roggg mult

Answer 1

Se calculeaza cantit. de soda caustica  pura
puritatea=p=mp.100:mt
mp=p.100:mt
mp=75.120:100=90g NaOH  pura

Trebuie calculata cantit. de Na aflata in 90 g NaOH PUR
 M NaOH=23+16+1=40------->1 mol=40g

40g NaOH------------23g Na
90 g-----------------------xg

x=90.23:40=51,75 g Na