Question

A 25 milliliter sample of HNO2 (aq) is neutralized by 32.1 milliliters of 0.150 M KOH (aq). What is the concentration of the acid

Answer 1

We would normally us Normality instead of Molarity for a titration equivalency calculation, but because both are monoprotic the values for N and M are the same.
25.0
m
L
H
N
O
3
⋅
?
M
H
N
O
3
=
32.1
m
L
K
O
H
⋅
0.150
M
K
O
H
?
M
H
N
O
3
=
32.1
m
L
K
O
H
⋅
0.150
M
K
O
H
25.0
m
L
H
N
O
3
M
H
N
O
3
=
0.1926