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va rog mult de tot !E pentru maine.​

Va Rog Mult De Tot E Pentru Maine class=

Răspuns :

M,NaOH=40g/mol

M,NaCl= 58,5g/mol

c= mdx100/ms---->ms=md+m,apa= 4g+46g=50g

c= 4x100/50%=8%

md,acid= cxms/100= 36,5x50./100g=36,5/2gHCl

niuNaOH=m/M=4/40mol=0,1mol

niuHCl=36,5//2x36,5mol= 0,5mol

1mol.........1mol........1mol

HCl + NaOH---> NaCl +H2O

x..............0,1mol......y

y=0,1molNaCl----> m=niuxM=0,1X58,5g=.......................calculeaza

 acidul este in exces, cu:  0,5mol-x=0,5-0,1=>0,4mol