Răspuns:
v,s= 300ml ( 1cm³=1ml)
m,s= roxv,s= 300x1,4g=420g
c=mdx100/ms---> md=51x420/100g=214,2gKOH
v,s=500ml
m,s= roxv,s= 1,5x500g= 750g
md= 50x750/100g=375g H2SO4
M,H2SO4=98g/mol M,KOH=56g/mol
H2S04 + 2KOH----> K2SO4 + 2H2O
98g............2x56g
214,2g............x x=m,KOH=244,8g aproximativ 245g
m,KOH,nereactionat= 375-245=>130g=md'
50= 130x100/ms'---> ms'=260g
ms",ce contine KOH nereactionat ms"=ms-ms'= 750-260=> 490g
Explicație: