Question

punctele c), d) si e) va rog! ​

Answer 1

Răspuns:

C=mdxa00/ms

c) M,H2SO4=98g/mol

md=m,H2SO4= niuxM= 1molx98g/mol=98g

m,apa= niuxM= 10x18g=180g

ms=md+m,apa=278g

c= 98x100/278=.............................calculeaza

b) M,KOH=56g/mol

md= niuxM=3X56g= 168g

ms=md+m,apa= 168+332=500g

c= 168x100/500=...........................calculeaza

c) M,CuSO4= 160g/mol    M,CuSO4.5H2O=160+80=> 240g/mol

240g piatra vanata.........160g CuSO4

25g.....................................x=16,7g

md= 16,7g

ms= m,piatra vanata+m,apa=256,7g

c= 16,7x100/256,7=..............................................calculeaza

aici trebuie sa stii ca orice concentratie se calculeaza cu masa sarii anhidre,fara apa

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