# How Are The Relative Strengths Of Acid And Base Determined?

As with acids, we may determine the relative strengths of bases by measuring their base-ionization constant, (Kb), in aqueous solutions, much as we did with acids. Stronger bases ionize to a larger degree than weaker bases in solutions of the same concentration, resulting in higher hydroxide ion concentrations than weaker bases in the same solution.

It is possible to tell the relative strengths of acids and bases by looking at the magnitudes of their ionization constants; in general the stronger the acid or base, the bigger the ionization constant. When comparing the strengths of a conjugate acid-base pair, there is a reciprocal relationship between them. The stronger the acid, the weaker its conjugate base is.

## How do you find the relative strength of an acid?

The equilibrium constants of acids in aqueous solutions can be used to calculate the relative strengths of different acids in the solution. Stronger acids ionize to a larger degree than weaker acids in solutions of the same concentration, resulting in higher concentrations of hydronium ions in stronger acids than in weaker acids.

## How do you predict the relative strengths of brnsted bases?

In addition to the general rule that the stronger of a pair of acids always has the weaker conjugate base, the respective strengths of Brnsted bases may be anticipated based on the relative strengths of their conjugate acids and the relative strengths of their conjugate bases.

## How do you find the relative acid strength of HCN and NH4+?

By comparing the ionization constants of NH4+ and HCN, you may determine the relative acid strengths of the two acids. 4.9 x 10 10 is the value of the ionization constant of HCN, which is provided in Appendix H. It is not specified what the ionization constant of NH4+ is, although the ionization constant of its conjugate base, NH 3, is given as 1.8 10 5.