The basicity of acids obtained from the hydrolysis of NCl₃ and PCl₃ respectively

Hydrolysis of NCl₃ and PCl₃ are:

$$\begin{gathered} {\mathrm{NCl}}_3 + 3{\mathrm{H}}_2\mathrm{O} \to {\mathrm{NH}}_3 + 3\mathrm{HOCl} \\ {\mathrm{PCl}}_3 + 3{\mathrm{H}}_2\mathrm{O} \to 3\mathrm{HCl} + {\mathrm{H}}_3{\mathrm{PO}}_3 \end{gathered}$$

Basicity of an acid is calculated by the number of hydrogen ions which can be released by an acid in an aqueous solution. 

• Basicity of HOCl is 1 as it has one hydrogen ion
• H₃PO₃ has basicity 2 because it has two ionisable hydrogen ions
• HCl has basicity one as it has one ionisable ion in the aqueous solution.