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Calculeaza partea de masa de KOH in solutia obtinuta prin amestecarea a 100g solutie de KOH de 10% cu 50g solutie de KOH de 50%

Răspuns :

Mirceavaman
[tex] \frac{c}{100} = \frac{md}{ms} [/tex];
[tex] \frac{20}{100} = \frac{md1}{100} [/tex] => md1=20g;
[tex] \frac{50}{100} = \frac{md2}{50} [/tex] => md2=(50×50)÷100=25g
[tex] \frac{cf}{100} = \frac{md1+md2}{ms1+ms2} [/tex];
[tex] \frac{cf}{100} = \frac{20+25}{100+50} = \frac{45}{150} [/tex] => cf=(45×100)÷150=30%