Question

The strength of an alkali depends on the concentration of the hydroxyl or the hydroxide ions produced by it in aqueous solution state I.e ., when dissolved in water.

But how is the strength of a base determined if it is not water soluble?

Answer 1

A different explanation of base is given below. It's little complicated but you will understand if you get help from your tutor. Else don't worry, you'll study more about this in higher Classes.
A base is also defined as a molecule that has the ability to accept an electron pair bond by entering another atom's valence shell through its possession of one electron pair.There are a limited number of elements that have atoms with the ability to provide a molecule with basic properties.Carbon can act as a base as well as nitrogen and oxygen. Fluorine and sometimes rare gases possess this ability as well.This occurs typically in compounds such as butyl lithium, alkoxides, and metal amides such as sodium amides. Bases of carbon, nitrogen and oxygen without resonance stabilization are usually very strong, or superbases, which cannot exist in a water solution due to the acidity of water. Resonance stabilization, however, enables weaker bases such as carboxylates; for example, sodium acetateace a weak base.