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v(HCl)=25,5cm3=0,0255dm3
d(HCl)=0.085mol/dm3
0,0255*0,085=0,0021675mol
1mol(NaOH)-1mol(HCl)
mNaOH=40g
mHCl=36,5g
40g(NaOH)-36,5g(HCl)
36,5*0,0021675=0,07911375g
x(NaOH)-0,07911375g
x=0,07911375*40/36,5
x=0,0867g=86,7mg
Myślę że zrozumiesz o co mi chodziło ;)