Question

Suppose a 0.100M solution of each of the following substances is prepared. Rank the pH of the resulting solutions from lowest to highest:

$\mathit{N}{\mathit{H}}_{\mathbf{4}}\mathit{B}\mathit{r}\mathbf{,}\mathit{N}\mathit{a}\mathit{O}\mathit{H}\mathbf{,}\mathit{K}\mathit{I}\mathbf{,}\mathit{N}\mathit{a}\mathit{C}{\mathit{H}}_{\mathbf{3}}\mathit{C}\mathit{O}\mathit{O}\mathbf{,}\mathit{H}\mathit{C}\mathit{l}\mathbf{.}$

Short answer

The lowest pH to the highest (acidic to basic) is,

$\text{HCl}<{\text{NH}}_4\text{Br}<\text{KI}<{\text{NaCH}}_3\text{COO}<\text{NaOH}$

Step-by-step solution

Concept used

Acid-base Concept:

The lower the solution will be more acidic and also the higher , the solution will be more basic.

Given information from the question

Given:

c solution = 0.100M

Arrange the resulting solutions' pH values from lowest to highest:

${\text{NH}}_4\text{Br},\text{NaOH},\text{Kl},{\text{NaCH}}_3\text{COO},\text{HCl}$

Determine pH if the resulting solutions from lowest to highest

As we know that the lower the solution will be more acidic and also the higher , the solution will be more basic.

- NH₄Br is the salt made of a weak base and strong acid which makes it's$\text{pH}<7$, more acidic.

- NaOH is the strong base which means it's pH will be >7 , basic.

- KI is the salt made of a strong base and strong acid which makes its pH neutral.

- NaCH₃COO is the salt made of a strong base and weak acid which makes it's pH>7, basic.

- HCl is the strong acid which means that$\text{pH}<7$, acidic.

Sort the given examples from the lowest  to the highest (acidic to basic)

The lowest pH to the highest (acidic to basic) is

$\text{HCl}<{\text{NH}}_4\text{Br}<\text{KI}<{\text{NaCH}}_3\text{COO}<\text{NaOH}$