Question

1.The pH sample of human blood was measured to be 7.41 at 25 degrees celsius. Calculate the hydrogen ion concentration, H' and hydroxide ion, OH for the sample.

Answer 1

Solution:

We can convert between pH and [H⁺] using the following equation:

pH = −log[H⁺]

[H⁺] = 10^−pH = 10^−7.41 = 3.89×10⁻⁸

[H⁺] = 3.89×10⁻⁸ M

For any aqueous solution at 25^∘C:

pH + pOH = 14

pOH = 14 − pH = 14 − 7.41 = 6.59

pOH = 6.59

We can convert between pOH and [OH⁻] using the following equation:

pOH = −log[OH⁻]

[OH⁻] = 10^−pOH = 10^−6.59 = 2.57×10⁻⁷

[OH⁻] = 2.57×10⁻⁷ M

Answer:

The hydrogen ion (H⁺) concentration is 3.89×10⁻⁸ M

The hydroxide ion (OH⁻) concentration is 2.57×10⁻⁷ M