Question

ce masa va avea solutia de hidroxid de potasiu preparta prin dizolvarea in apa a 30g de KOH, daca partea de masa a substantei dizolvate este de 28%

Answer 1

c = md/ms * 100
md = 30 g
c = 28 %
ms = md/c*100 = 30/28 * 100 = 107.14 g solutie

Answer 2

Cp=md/ms*100==>ms=md*100/Cp=30*100/28=107.142g KOH