Question

A weak base is added to water. Which information is required to find the strength of its conjugate acid?

the value of Kb and the concentration of the weak base
the value of Kw only
the values of Kb and Kw
the values of and Kw and the concentration of the weak base

Answer 1

Answer: C) the values of Kb and Kw

Explanation: i just took the test

Answer 2

The values of Kb and Kw

Step-by-step explanation:

The conjugated acid would produced when we have the reaction:

`A^- + H_2O~->~HA~+~OH^-`

The equilibrium of this reaction is rule the Kb expression. If we want to solve Ka we have to use the equation:

`Kw~=~Ka*Kb`

Solving for Ka:

`Ka=(Kw)/(Kb)`

Therefore we need to know Kw and Kb.