Hydrochloric Acid and pH Concepts

The video tutorial explains how to calculate the pH of a 0.001 molar solution of hydrochloric acid (HCL). It begins by identifying HCL as a strong acid that dissociates completely in water into H+ and Cl- ions. The tutorial then demonstrates the calculation of pH by taking the negative logarithm of the H+ ion concentration, resulting in a pH of 3. This confirms the acidic nature of the solution, as expected for hydrochloric acid.

What is the first step in determining the pH of a 0.001 molar solution of hydrochloric acid?

• Recognize it as a weak acid

• Identify it as a strong acid

• Measure the temperature

• Calculate the molarity of Cl- ions

What happens to hydrochloric acid when it is dissolved in water?

• It changes color

• It dissociates completely into ions

• It remains undissociated

• It forms a precipitate

What ions are produced when hydrochloric acid dissociates in water?

• H2O and Cl-

• OH- and H+

• H+ and Cl-

• Na+ and Cl-

How do you calculate the pH of a solution using the concentration of H+ ions?

• Add 7 to the concentration

• Divide the concentration by 2

• Take the negative logarithm of the concentration

• Multiply the concentration by 10

What is the pH of a 0.001 molar solution of hydrochloric acid?

• 10

• 3

• 7

• 1

Why is the pH of hydrochloric acid expected to be below 7?

• Because it is a salt

• Because it is a base

• Because it is a neutral solution

• Because it is an acid

What does the final pH value of 3 indicate about the solution?

• It is a basic solution

• It is a neutral solution

• It is an acidic solution

• It is a saturated solution