GCSE Chemistry – Strong Acids & Weak Acids | pH & Concentration of Hydrogen Ions (2026/27 exams)

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*** WHAT’S COVERED ***
1. The difference between strong and weak acids.
* Acids ionise in aqueous solutions to release hydrogen ions.
* Strong acids, like hydrochloric acid, ionise completely.
* Weak acids, like ethanoic acid, only partially ionise in a reversible reaction.
2. The distinction between acid strength and concentration.
* Strength is the proportion of acid molecules that ionise in water.
* Concentration is the amount of acid present in a certain volume of solution.
3. The relationship between pH and hydrogen ion concentration.
* pH is a measure of the concentration of hydrogen ions.
* A lower pH indicates a higher concentration of hydrogen ions.
* The pH scale is logarithmic: a change of one pH unit represents a tenfold change in hydrogen ion concentration.
4. How acid strength and concentration determine pH.
* At the same concentration, a strong acid will have a lower pH than a weak acid.

*** EXAM BOARD SPECIFIC INFO ***
– Higher tier only
– All exam boards
– Triple and combined science

*** CHAPTERS ***
0:00 Introduction
0:19 What is an Acid?
1:00 Strong Acids
1:20 Weak Acids
2:35 Strength vs Concentration
3:18 pH and Hydrogen Ion Concentration

*** PLAYLISTS ***

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