Formula concentratiei procentuale:
[tex]C= \frac{md}{ms}*100 [/tex]
unde md reprezinta substanta dizolvata iar ms masa de solutie exprimata ca:
[tex]ms=md+m_{apa} [/tex]
Deci:
md=300g sare ms=300+800=1100g saramura
[tex]C= \frac{300}{1100} *100=27,27[/tex]%