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26 Acids & Bases 2 MCQ2

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Questions and Answers

What is the pH of a solution when [H₃O⁺] = [OH⁻]?

Exactly 14

Exactly 7 (correct)

Exactly 0

Exactly 1

What is the dissociation constant of water (Kw) at 298K?

1 x 10⁻¹⁸

1 x 10⁻¹²

1 x 10⁻¹⁶

1 x 10⁻¹⁴ (correct)

What is the pH range of the indicator Methyl Orange?

8-10

3-5 (correct)

12-14

5-7

What is the formula to calculate pOH?

pOH = -log [OH⁻] Signup and view all the answers

What is the colour of the base in the indicator Phenolphthalein?

Pink Signup and view all the answers

What is the definition of pH?

The negative logarithm to the base 10 of the hydrogen ion concentration Signup and view all the answers

What is the limitation of the pH scale?

It is not useful outside the 0-14 range Signup and view all the answers

According to the self-ionisation of water, what is the equilibrium reaction?

H₂O + H₂O ⇋ H₃O⁺ + OH⁻ Signup and view all the answers

What is the concentration of H₃O⁺ and OH⁻ ions in pure water at 298K?

1 x 10⁻⁷ Signup and view all the answers

What is the pH of a solution when [H₃O⁺] = 1 x 10⁻⁵?

5 Signup and view all the answers

What is the pH range of the indicator Phenolphthalein?

8-10 Signup and view all the answers