Question

200g vitriol de c=49% reactioneaza cu solutie soda caustica de c=40%
a) md vitriol
b)md soda caustica
c)ms soda
d) g moli sare rezultata

Answer 1

a) C=md/ms*100 => md=C*ms/100=49*200/100= Calculeaza !!

b) H2SO4 + 2NaOH -> Na2SO4 + 2H2O

98g H2SO4...................2*40g NaOH
98g H2SO4 (md aflat).....x=80g NaOH

md NaOH = 80g 

MNaOH=ANa+AO+AH=23+16+1=40g/mol

MH2SO4=2AH+AS+4AO=2*1+32+4*16=98g/mol

c) C=md/ms*100 => ms=md*100/C=80*100/40 = Calculeaza !!

d) 1 mol H2SO4..................1 mol Na2SO4
1 mol H2SO4....................1 mol Na2SO4 (sare)