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Cp-stężenie procentowe
ms-masa substancji
mr-masa roztworu
Cp=(ms/mr)*100%
Cp=9%
ms=?
mr=30dag
9=(ms/30)*100 /:100
0,09=ms/30 /*30
2,7=ms
II sposób:
9% z 30 dag, to 0,09*30dag=2,7dag
0,09- 9%
x/30 dkg=0,09
x=2.7 dkg
prościej 0.09 * 30 dkg= 2.7 dkg