Question

se amesteca 200g solutie de clorula se sodiu de concentratia de 20 la suta cu 300g solutie clorula de potasiu de concentratia 20 la suta cu 500 g apa.calculati concentratia.va rog ajutatima

Answer 1

msNaCl=200g (sa scri indice 1, ca eu nu pot)
c=20%
mdNaCl=?
c=md/ms•100
md=c•ms/100
md=20•200/100
md1=40g

ms=300g
c=20%
md2=ms•c/100
md2=300•20/100
md2=60g
md final=40+60=100
msfinal=200+300+500
=1000
c finala=md•ms/100
c finala=100•1000/100
cfinala=1000%