Răspuns:
1.c3=md3x100/ms3 unde md3=md1+md2
ms3=ms1+ms2=200g
c=mdx100/ms
md1= c1xms1/100= 40x60/100g=24g
md2= c2xms2/100= 15x140/100g=21g
c3= 45x100/200=22,5%
2. c,m= niu/V
niu,HCl= 1x0,1mol=0,1molHCl
1mol.....1mol
HCl + NaOH----> NaOH + HCl
c,m=1mol/.0,05 l= 2M NaOH
Explicație: