Question

In chemistry, the pH of a solution is a measure of the acidity or alkalinity of a solution. Water has a pH of 7 and, in general, acids have a pH less than 7 and alkaline solutions have a pH greater than 7. Find the pH of a solution with a hydronium ion concentration of 7.8×10−2 moles/liter. Round your answer to two decimal places, if necessary.

Answer 1

The pH of a solution with a hydronium ion concentration of 7.8×10−2 moles/liter is approximately 1.11, indicating that the solution is acidic.

Step-by-step explanation:

Finding the pH of a Solution

The pH of a solution is a measure of the acidity or alkalinity and is calculated using the concentration of hydronium ions (H3O+). To find the pH of a solution with a hydronium ion concentration of 7.8×10−2 moles/liter, we use the formula pH = -log[H3O+]. Plugging in the concentration, we get pH = -log(7.8×10−2). Using a calculator, this comes out to approximately pH = 1.11.

A pH less than 7 indicates that the solution is acidic. Given that the hydronium ion concentration of this solution is higher than the neutral concentration of 1.0×10−7 M in pure water, the solution is indeed acidic. Our calculated pH of 1.11 confirms this.

Answer 2

pH = 1.11

Step-by-step explanation:

pH = - log [H₃O⁺]

pH = - log 7.8×10⁻²

pH = 1.11

It's totally an acidic solution.

pH HAS NO UNITS