Question

Concentratia procentuala masica a unei solutii de hidroxid de potasiu de concentratie molara 6.89mol/L si densitate 1,286g/cm^3 este...

Answer 1

conform definitiei conc. molare,

6,89molKOH.......1000ml sol

sau

m= niuxM= 6,89molx56g/mol=385,8g KOH

m= roxV= 1,286g/mlx1000ml=1286g

deci    385,8gKOH..............1286g

           x....................................100      conform definitiei conc. procentuale

x=.........................calculeaza !!!!