11 Questions
What is the pH of a solution when [H₃O⁺] = [OH⁻]?
Exactly 7
What is the dissociation constant of water (Kw) at 298K?
1 x 10⁻¹⁴
What is the pH range of the indicator Methyl Orange?
3-5
What is the formula to calculate pOH?
pOH = -log [OH⁻]
What is the colour of the base in the indicator Phenolphthalein?
Pink
What is the definition of pH?
The negative logarithm to the base 10 of the hydrogen ion concentration
What is the limitation of the pH scale?
It is not useful outside the 0-14 range
According to the self-ionisation of water, what is the equilibrium reaction?
H₂O + H₂O ⇋ H₃O⁺ + OH⁻
What is the concentration of H₃O⁺ and OH⁻ ions in pure water at 298K?
1 x 10⁻⁷
What is the pH of a solution when [H₃O⁺] = 1 x 10⁻⁵?
5
What is the pH range of the indicator Phenolphthalein?
8-10
Test your knowledge of the pH scale, its limitations, and water's self-ionization reaction. Learn how to calculate pH and understand the concept of Kw, the dissociation constant of water.
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