Question

Zmieszano 50g 20% roztworu z 70g 5% roztworu. Oblicz stężenie procentowe otrzymanego roztworu.

Answer 1

Cp=ms : mr * 100%

 

ms= Cp * mr : 100%

 

ms1=20% * 50g : 100% = 10g

ms2=5% * 70g : 100% = 3,5g

 

ms=10g + 3,5g = 13,5g

mr=50g + 70g = 120g

 

Cp=13,5g : 120g * 100% = 11,25%

 

 

Pliss daj najj:)))

Answer 2

50g 20%...................x - 5

.................x%

70g 5%....................20 - x

50/70 = x-5/20-x

50(20-x) = 70(x-5)

1000-50x = 70x-350

120x = 1350

x = 11,25%