Question

200 grame de soda caustica de puritate 90 % se amesteca cu 300grame apa calculați concentratia soluției obtinuta

Answer 1

m(imp)=200g
p%=90%
m(H2O)=300g
Cp=?

p%=[m(pur)•100]/m(imp)

=>m(pur)=[p%•m(imp)]/100
m(pur)=90•200/100
m(pur)=180g=md

ms=md+m(H2O)=180+300=480g

Cp=md•100/ms
Cp=180•100/480
Cp=37,5%