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Cp=Ms/Mr *100%
Ms=5g
Mr=150+5=155g
Cp=5/155 *100%
Cp=ok. 3,22%
5g siarczanu-----155g roztworu (5g siarczanu + 150g wody)
xg siarcznu-------100g roztworu
x=3,22g siarczanu
x=3,22%