Question

Determinati cate grame de hidroxid de sodiu NaOH,sunt necesare pentru a prepara 250 ml solutie 0,1N (Ana=23 ;Ao=16 ;Ah=1) .

Answer 1

MNaOH=ANa+AO+AH=23+16+1=40g/mol

EgNaOH=M/1=40/1=40g

Cn=0.1N

Vs=250mL=0.25L

Cn=md/Eg*Vs==>md=Cn*Eg*Vs=0.1*40*0.25=1g NaOH