Brainlag PlusStrength versus concentration, how pH changes by one unit for every factor of 10 in hydrogen ion concentration, and titrations with their calculations.
Strong, weak, concentrated, dilute (Higher)
A strong acid is completely ionised in water: every HCl molecule becomes H⁺ and Cl⁻.
Hydrochloric, nitric and sulfuric acids are strong.
A weak acid is only partially ionised: most ethanoic acid molecules stay whole. Ethanoic, citric and carbonic acids are weak.
Concentration is a different idea: how much acid is dissolved in each dm³. You can have a dilute strong acid or a concentrated weak one.
"Strong" is about how much of the acid ionises; "concentrated" is about how much acid there is. For the same concentration, a strong acid has a lower pH than a weak acid.
The rest of this lesson and its 15 practice questions are in Plus.
Screen 1 of 4, free to read.
- 15 exam-style questions, marked as you go, each with a worked solution
- The Molar Mass Calculator beside every question
- Anything you get wrong is saved to your flashcards