Ka values for four weak acids are given below: acid A(Ka=2.6 ×10^-4) acid B(Ka=3.

step 1 acids are given with their ionization constant KA. We have to arrange the acids in order of incr

Ka values for four weak acids are given below: acid ...

$K_a$ values for four weak acids are given below: $$ \begin{aligned} & \text { acid } A\left(K_a=2.6 \times 10^{-4}\right) \\ & \text { acid } B\left(K_a=3.7 \times 10^{-5}\right) \\ & \text { acid } C\left(K_a=5.8 \times 10^{-4}\right) \\ & \text { acid } D\left(K_a=1.5 \times 10^{-3}\right) \end{aligned} $$ a. Arrange the four acids in order of increasing acid strength (weakest first, strongest last). b. Arrange the conjugate bases of the acids (identify as base $A$, etc.) in order of increasing base strength (weakest base first, strongest last).

$K_a$ values for four weak acids are given below:

$$
\begin{aligned}
& \text { acid } A\left(K_a=2.6 \times 10^{-4}\right) \\
& \text { acid } B\left(K_a=3.7 \times 10^{-5}\right) \\
& \text { acid } C\left(K_a=5.8 \times 10^{-4}\right) \\
& \text { acid } D\left(K_a=1.5 \times 10^{-3}\right)
\end{aligned}
$$

a. Arrange the four acids in order of increasing acid strength (weakest first, strongest last).
b. Arrange the conjugate bases of the acids (identify as base $A$, etc.) in order of increasing base strength (weakest base first, strongest last).

Key Concepts

Acid Dissociation Constant (Ka)

Ka is a quantitative measure of acid strength that represents the equilibrium constant for the dissociation of an acid into its conjugate base and a proton. A higher Ka indicates that an acid more readily donates protons in solution, meaning it is a stronger acid, while a lower Ka signifies a weaker acid since there is less dissociation.

Acid Strength

Acid strength refers to the extent to which an acid donates a proton in solution. This is determined by its Ka value; acids with higher Ka values are stronger because they dissociate more completely, whereas acids with lower Ka values are weaker due to their limited dissociation.

Conjugate Bases

A conjugate base is formed when an acid donates a proton. The properties of a conjugate base are directly related to the properties of its parent acid. In acid-base chemistry, understanding the behavior of conjugate bases is important for predicting the direction of acid-base reactions.

Relationship between Acid and Conjugate Base Strength

There is an inverse relationship between the strength of an acid and the strength of its conjugate base. A strong acid (with a high Ka) has a weak conjugate base because the acid readily donates its proton, leaving a less reactive conjugate base. Conversely, a weak acid (with a low Ka) has a relatively stronger conjugate base, as it does not donate its proton as readily.

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