Question

A 100 mL sample of hydrobromic acid, HBr, is titrated to

anendpoint with 24.0 mL of 1.5 N NaOH. What is theconcentration of
HBr?

Answer 1

0.36 N

Step-by-step 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