A100 ml sample of hydrobromic acid, hbr, is titrated to
anendpoint with 24.0 ml of 1.5 n naoh. what is theconcentration of
hbr?

0.36 N

Explanation:

Let's consider the neutralization between HBr and NaOH.

HBr + NaOH → NaBr + H₂O

The equivalents of NaOH that reacted are:

24.0 × 10⁻³ L × 1.5 eq/L = 0.036 eq

Since the reactions are equivalent to equivalent, also 0.036 equivalents of HBr reacted.

The normality of HBr is:

N = 0.036 eq / 0.100 L = 0.36 N