Comparing concentration with strength
I can use the pH scale to work out concentration differences between solutions relating to their pH, and discuss the differences between strong and weak acids.
Comparing concentration with strength
I can use the pH scale to work out concentration differences between solutions relating to their pH, and discuss the differences between strong and weak acids.
Lesson details
Key learning points
- pH is a logarithmic scale (as hydrogen ion concentration increases by a factor of 10, the pH decreases by 1).
- For a given concentration, a stronger acid contains more H⁺ ions.
- Titration curves can be used to show the change in pH to allow chemists to pinpoint a more accurate end point.
- A strong acid is completely ionised in aqueous solution, a weak acid only partially ionises.
- Titration curves show how the pH changes throughout a neutralisation reaction.
Common misconception
Pupils often confuse the chemistry meaning of strong/weak and concentrated/dilute due to the use of these words in everyday conversation.
Clear definitions of the words are required with practice opportunities to recognise/describe whether the substances are strong or weak acids and if concentrated or dilute.
Keywords
Hydrogen ion - A positively charged ion formed when a hydrogen atom loses an electron (H⁺).
PH - The measure of the hydrogen ion (H⁺) concentration of a solution.
Concentration - The amount of solute dissolved in a certain volume of solution.
Strong acid - An acid which fully dissociates to form H⁺ ions in aqueous solution.
Weak acid - An acid which partially dissociates to form H⁺ ions in aqueous solution.
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
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Starter quiz
6 Questions
Exit quiz
6 Questions
a positive ion formed when a hydrogen atom loses an electron
the measure of hydrogen ion concentration in a solution
the amount of solute dissolved in a certain volume of solution
an acid that fully dissociates to form H⁺ ions in aqueous solution
an acid that partially dissociates to form H⁺ ions in aqueous solution