solutia HCl : nHCl =[ c·ms/100]/36,5
solutia NaOH : nNaOH = [c·ms/100]/40 nHCl > nNaOH
reactioneaza : [c·ms/100]/40 moli HCl + [c·ms/100]/40 moli NaOH
exces : HCl : m exces = {[c·ms/100]/36,5- [c·ms/100/40]}·36,5
m exces = c·ms/100 ·[ 1 - 36,5/40 ] = 10·200/100 ·0,0875 = 1,75gHCl
b)ms = 400g md = 1,75g c = 175/400 = 0,4375%