Question

Se amesteca 30 g KOH 40% cu 50 g KOH 20% si 100 g H₂O.Concentratia procentuala a solutiei finale va fi:
a) 30%
b) 27,5%
c)12,22%
d) 10,7%

Answer 1

md=c*ms/100
md1=c1*ms1/100=40*30/100=12g KOH
md2=c2*ms2/100=20*50/100=10g KOH
cf=mdf*100/msf=(12+10)*100/(30+50+100)=22*100/180=12,22% => c)