Arrhenius theory of acids and bases

Define bases according to Arrhenius theory.

"Those substances which give hydrogen ion (${\mathrm{H}}^{+}$) when they decompose in water are called acids and those substances that decompose in water and give hydroxyl ion (${\mathrm{OH}}^{-}$) are called bases." This definition was given by:

Write definitions of acid and base according to Arrhenius.

Calculate the number of equivalents in $10$ $\mathrm{l}\mathrm{i}\mathrm{t}\mathrm{r}\mathrm{e}$ of $0.5$ $\mathrm{M}\mathrm{}\mathrm{B}\mathrm{a}(\mathrm{O}\mathrm{H}{)}_2$ Solution $(\mathrm{B}\mathrm{a}=137)$ .

Who proposed ionic theory of acid and bases?

The basicity of phosphorous acid is-

Would gaseous $\mathrm{H}\mathrm{C}\mathrm{l}$ be considered as an Arrhenius acid?

Diacidic base is

When rain is accompanied by a thunderstorm, the collected rain water has a pH value