Indicate whether each solution is acidic, basic, or neutral.

a. [H3O+] = 6.9 x 10-1 M

This solution is acidic.

b. [H3O+] = 8.2 x 10-13 M

This solution is basic.

c. [H3O+] = 3.2 x 10-1 M

This solution is acidic.

The answer would B

To determine whether a solution is acidic, basic, or neutral, we need to examine the concentration of hydronium ions, [H3O+]. The concentration of hydronium ions in a solution is a measure of the acidity or basicity of that solution.

When the concentration of hydronium ions is greater than 1 × 10^7 M, the solution is considered acidic. This is because a high concentration of hydronium ions indicates a high concentration of hydrogen ions (H+), which is characteristic of an acidic solution.

When the concentration of hydronium ions is less than 1 × 10^-7 M, the solution is considered basic. This is because a low concentration of hydronium ions indicates a low concentration of hydrogen ions (H+), which is characteristic of a basic solution.

When the concentration of hydronium ions is approximately equal to 1 × 10^-7 M, the solution is considered neutral. This is because at this concentration, the concentration of hydrogen ions (H+) and hydroxide ions (OH-) is approximately equal, resulting in a neutral pH.

Now let's go through the provided solutions:

a. [H3O+] = 6.9 x 10^-1 M
The concentration of hydronium ions is greater than 1 × 10^-7 M, indicating a high concentration of hydrogen ions. Therefore, this solution is acidic.

b. [H3O+] = 8.2 x 10^-13 M
The concentration of hydronium ions is less than 1 × 10^-7 M, indicating a low concentration of hydrogen ions. Therefore, this solution is basic.

c. [H3O+] = 3.2 x 10^-1 M
Similar to solution a, the concentration of hydronium ions is greater than 1 × 10^-7 M, indicating a high concentration of hydrogen ions. Therefore, this solution is also acidic.