Question

What is the [H+] of a solution with a pH of 5.6? Use a scientific calculator.

a) 2.5×10⁻⁶
b) 8.3×10⁻⁶
c) 7.7×10⁻⁵
d) 5.0×10⁻⁵

Answer 1

The concentration of hydrogen ions ([H+]) in a solution with a pH of 5.6 is calculated using a scientific calculator as the antilog of the negative pH and is found to be a)2.5×10⁻⁶ M.

Step-by-step explanation:

The pH of a solution represents the acidity or basicity level and is calculated as the negative logarithm of the hydrogen ion concentration. To determine the concentration of hydrogen ions ([H+]) in a solution with a pH of 5.6, you would use the following relationship, which is derived from the definition of pH:

pH = -log [H+]

To find [H+], you would take the antilog (inverse logarithm) of the negative pH:

[H+] = 10-pH

Using a scientific calculator, you perform this calculation:

[H+] = 10-5.6 = 2.51 × 10-6 M

Therefore, the correct answer is a) 2.5×10⁻⁶.