A 25.0 cm³ aliquot of NaOH solution was titrated against 0.100 mol/dm³ HCl. If the average titre of HCl used was 20.00 cm³, what is the concentration of the NaOH solution in mol/dm³?

Let's break down this titration problem step by step. Since the burette readings are not provided, I will assume an average titre value for the acid.

• Assumed Volume of B pipetted ($\text{V}_B$): 25.0 $\text{cm}^3$ = 0.025 $\text{dm}^3$
• Assumed Average Volume of A used ($\text{V}_A$): 20.00 $\text{cm}^3$ = 0.020 $\text{dm}^3$

Molar Masses:

• $\text{NaOH}$: $23 (Na) + 16 (\