Oblicz stężenie procentowe roztworu Ca(NO3)2 otrzymanego po rozpuszczeniu 20g Ca(NO3)2·4H2O w 130g wody.
mCa(NO₃)₂*4H₂O=40g+2*14g+6*16g+4(2*1g+16g)=164g+72g=236g
164g Ca(NO₃)₂ ----------------- 236g Ca(NO₃)₂*4H₂O
xg Ca(NO₃)₂ --------------------- 20g Ca(NO₃)₂*4H₂O
xg=164g*20g/236g
xg=13,9g
ms=13,9g
mr=20g+130g=150g
Cp=?
Cp=ms/mr * 100%
Cp=13,9g/150g * 100%
Cp=9,27%
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mCa(NO₃)₂*4H₂O=40g+2*14g+6*16g+4(2*1g+16g)=164g+72g=236g
164g Ca(NO₃)₂ ----------------- 236g Ca(NO₃)₂*4H₂O
xg Ca(NO₃)₂ --------------------- 20g Ca(NO₃)₂*4H₂O
xg=164g*20g/236g
xg=13,9g
ms=13,9g
mr=20g+130g=150g
Cp=?
Cp=ms/mr * 100%
Cp=13,9g/150g * 100%
Cp=9,27%