Question

Complete the table. Fill in the missing entries in second and third Columns.

Answer 1

Category --------- General chemistry

Sub-category ------- Acid and Base pH

ANSWER

Solution A ------- 9.35

Solution B ---------- 7.1 x 10^-7 mol/L

solution C ---------- 3.11

Step-by-step explanation

pH measures the degree of acidity and alkalinity of a substance.

For part A

The hydroxonium ion of the solution is 4.5 x 10^-10 mol/L

Recall,

`pH\text{ = -log }\lbrack\text{ H}_3O^+\rbrack`
`\begin{gathered} \text{ pH = -log }\lbrack\text{ 4.5 }*\text{ 10}^(-10)\rbrack \\ \text{ pH = 9.35} \end{gathered}`

For solution B

The pH of the solution is 6.15

`\begin{gathered} \text{ pH = -log }\lbrack\text{ H}_3O^+\rbrack \\ \text{ 6.15 = -log }\lbrack\text{ H}_3O^+\rbrack \\ \text{ }\lbrack\text{ H}_3O^+\rbrack\text{ = 10}^(-6.15) \\ \lbrack\text{ H}_3O^+\rbrack\text{ = 7.1}*\text{ 10}\frac{^{-7\text{ }}mol}{L} \end{gathered}`

For solution C

The hydroxonium ion is 7.8 x 10^-4 mol/L

`\begin{gathered} \text{ pH = -log }\lbrack H_3O^+\rbrack \\ \text{ pH = -log }\lbrack\text{ 7.8 }*\text{ 10}^(-4)\rbrack \\ \text{ pH = 3.11} \end{gathered}`