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masa roztworu 15%:
masa wody:
mw = 10 g - 6.67 g = 3.33 g
Należy wziąć 6.67 g 15% roztworu Na2CO3 i 3.33 g wody.
proszę :)
Cp1=10%
mr=10g
ms=10%*10g/100%=1g
1g - 15%
x - 100%
x=100/15=6,67g 15% roztworu
mw=10g-6,67g=3,33g