Question

Ile gramów naoh nalezy rozpuscic w 100g wody aby otrzymac 10% roztworu

Answer 1

c% = 10 %

m H2O = 100 g

m s=  ????

c% = ms / ms + m H2O * 100 %

c % * ( ms + m H2O) =100 % * ms

c% * ms + c% * m H2O = 100 % * ms

c% * m H2O = ms (100% - c%)

ms = c% * mH2O / 100% - c%

ms = 10% * 100 g / 100% - 10% = 11,11 g