Question

In 600 g solutie de hidroxid de sodiu avand c = 30% se adauga apa pana obtin 1000 g de solutie. Calculati cantitatea de apa adaugata si concentratia solutiei rezultate

Repede va rog frumos !

Answer 1

m.apa = ms.finala - ms.initiala

=> m.apa = 1000 - 600 = 400 g apa

c% = md x100/ms

=> md = ms.init. x c%.init / 100

=> md = 600x30 / 100

=> md = 180 g hidroxid de sodiu

ms.final = 1000 g

md = acelasi = 180 g

=> c%.fin. = mdx100/ms.fin.

=> c%.fin = 180x100/1000

=> c%.fin = 18%