a)Ile kilogramow wody nalezy dodac do 300 kg roztworu cukru o stężeniu 16%, aby otrzymac roztwor o stezeniu 15% b)Ile kilogramow wody nalezy dodac do roztworu cukru o stezeniu 18% aby otrzymac 900 kg roztworu o stezeniu 17%
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odpowieź na zadanie:
a)
mr1= 300gkg
Cp2= 15%
Cp= ms*100% /mr ms= Cp*mr/ 100%
ms= 16% * 300kg/ 100%= 48kg
mr2 = ms*100%/ Cp2
mr2= 48kg* 100%/ 15%= 320kg
mH2O= mr2- mr1= 320kg- 300kg= 20kg
b)
mH2O= ?
Cp1= 18%
Cp2= 17%
mr2= 900kg
Cp= ms*100%/mr
ms= Cp2* mr2/ 100%
ms= 17% * 900kg/ 100%= 153kg
mr1= ms*100%/ Cp1
mr1= 153kg * 100%/ 18%= 850kg
mH2O= mr2-mr1= 900kg- 850kg= 50kg