Răspuns:
C,m4= niu4/V4
V4= v2+V3=100ml= O,1 L
M,NaOH= 40g/mol
md1= 100g===> niu1= md1/M=100/40mol=2,5 mol NaOH
md2= cxms/100= 20x50/100g= 10g--> niu2=10/40mol=0,25molNaOH
niu3=c,mxV= 2X0,05 mol= 0,1mol
niu4=2,5+0,25+0,1=2,85mol
c,m= 2,85mol/0,1 l= 28,5 M
AM CONSIDERAT ca solutiile date au densitatea 1g/ml
Explicație: