The concentration of the base is 0.162 M
We know that neutralization is a reaction in which an acid is reacted with a base to yield salt and water only. The first step is to write down the equation of the reaction as follows;
[tex]NaOH + HCl ----- > NaCl +H_{2} O[/tex]
Now using the formula;
CAVA/CBVB = NA/NB
CA = concentration of acid
CB = concentration of base
VA = volume of acid
VB = volume of base
NA = number of moles of acid
NB = number of moles of base
CAVANB = CBVBNA
CB = CAVANB/VBNA
CB = 0.250 M * 22.7 mL * 1/35.0 mL * 1
CB = 0.162 M
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