BRAINCAKECalculating the pH of a Strong Acid
Strong acids completely dissociate in aqueous solution.
HCl(aq) → H+(aq) + Cl-(aq)
This means that the acid concentration and the hydrogen ion concentration are the same. [H+] = [HCl] so the pH of 0.2moldm-3 of HCl is -log100.2 which is 0.699 to 3 s.f.
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Key terms in this lesson
- pH
- A measure of the hydrogen ion concentration of a solution, defined as pH = -log10[H+].
- strong acid
- An acid that completely dissociates into its ions in aqueous solution.
More in Acids, Bases and Buffers
- Conjugate Acid-Base Pairs
- Strong and Weak Acids and Bases
- The Acid Dissociation Constant Ka
- pH
- Calculating the pH of a Weak Acid
- The Ionic Product of Water Kw
- Calculating the pH of a Strong Base
- Buffer Solutions
All 15 lessons in Acids, Bases and Buffers · All OCR A-level Chemistry topics