In this lesson, we will learn how to calculate the pH of a solution and describe the ion-product constant of water.

Students will be able to

Q1:

At a temperature of 50∘C, the value of 𝐾 is 5.476×10.

What is the pH of water at this temperature? Give your answer to 1 decimal place.

What is the pOH of water at this temperature? Give your answer to 1 decimal place.

At this temperature, is water acidic, basic, or neutral?

Q2:

A solution at 25∘C has an [OH]– of 1.26×10 mol/L. Is the solution acidic, basic, or neutral?

Q3:

The pH of a solution is measured to be 4.15. What is the concentration of hydronium ions in this solution? Give your answer to 2 decimal places and in units of mol⋅dm^{−3}.

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