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Cp=20%
mr=300g
ms=Cp*mr/100%
ms=20*300/100
ms=60g
300g roztworu - 60g subst. = 240g wody
2)
mHCOOH=2u+12u+32u=46u
mH : mC : mO = 2 : 12 : 32
mH : mC : mO = 1 : 6 : 16
3)
Cp=10%
mr=300g
ms=Cp*mr/100%
ms=10*300/100
ms=30g
Dodano 50g kwasu, więc
ms=30g+50g=80g
mr=300g+50g=350g
Cp=ms*100%/mr
Cp=80*100/350
Cp = 22,86%
2. kwas mrówkowy CH2O2
C = 12g/mol 2xH = 2g/mol 2xO = 32g/mol 12C:2H:32O = 6:1:16 - stosunek masowy
3. 300g+50g = 350g , 10%*300* = 30g, 30g+50g = 80g, 80g/350g * 100% = 22,85% - stężenie procentowe otrzymanego kwasu