Question

Se amesteca 200g solutie de KI cu c%=10% cu 400g solutie KL de concentratie 20%.Se obtine o solutie de concentratie;

Answer 1

ms1=200 g

c1=10%

ms2=400%

c2=20%

cf=?

$\frac{c1}{100}= \frac{md1}{ms1}$

$md1= \frac{c1*ms1}{100}$

md1=10*200/100=> md1=20g

$\frac{c2}{100}= \frac{md2}{ms2}$

$md2= \frac{c2*ms2}{100}$

md2=20*400/100=> md2=80 g

mdf=md1+md2= 20+80= 100 => mdf=100g

msf=ms1+ms2=200+400 => msf=600g

$\frac{cf}{100}= \frac{mdf}{msf}$

cf=100*mdf/mdf

cf=100*100/600= 16,6 => cf=16,6%