Question

Calculati masa de solutie de concentratie 5% care contine 17g de soda caustica.
Câtă apa contine solutia?
Dau coroana,help me

Answer 1

c% = md x 100/ ms

unde md = 17 g soda si c% = 5%

=> ms = md x 100 / c%

=> ms = 17x100/5

=> ms = 340 g sol. soda

ms = md + m.apa

=> m.apa = ms - md

=> m.apa = 340 - 17

=> m.apa = 323 g apa