The concentration of solutions can be expressed in number of ways such that Normality, Molarity, Molality, Mole fractions, Strength, `%` by weight, `%` by volume and `%` by strength. The molarity of ionic compound is usually expressed as formality beacuse we use formula weight of ionic compound. Addition of water to a solution changes all these terms, however increase in temperature does not change molality, mole fraction and `%` by weight terms.
The weight of `Na_(2)CO_(3)` sample of `95%` purity required to neutralise `45.6 mL` of `0.235 N` acid is:
A. `0.60 g`
B. `0.80 g`
C. `0.40 g`
D. `0.20 g`