Jaka ilość wody należy dodać do 3000 mg 30% roztworu, aby powstał roztwor 20%
mwdodanej=? mr1=3000mg=3g Cp1=30% Cp2=20%
ms=mr1*Cp1/100%
ms=0,9g
mr2=ms*100%/Cp2
mr2=4,5g
mwdodanej=mr2-mr1
mwdodanej=1,5g
mr-r=3g
Cp=30%
ms= 3g-100%
x - 30%
------------
x=0,9g =>ms
20% tzn:
20gsubst.- 100g r-r
0,9g - x
-------------------------
x=4,5
m wody dod= 4,5-3 = 1,5g
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mwdodanej=? mr1=3000mg=3g Cp1=30% Cp2=20%
ms=mr1*Cp1/100%
ms=0,9g
mr2=ms*100%/Cp2
mr2=4,5g
mwdodanej=mr2-mr1
mwdodanej=1,5g
mr-r=3g
Cp=30%
ms= 3g-100%
x - 30%
------------
x=0,9g =>ms
20% tzn:
20gsubst.- 100g r-r
0,9g - x
-------------------------
x=4,5
m wody dod= 4,5-3 = 1,5g