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  1. This means that the pH values of strong acids are lower than that of weak acids, which explains why the rate of reaction of strong acids with substances (such as metals, metal carbonates etc) is ...

  2. Strong acids dissociate completely in water. This produces a solution with a high concentration of H + ions. This means that strong acids have a low pH, typically pH 1 - 3. Examples of strong acids include: Hydrochloric acid, HCl. HCl (aq) → H+ (aq) + Cl– (aq) Nitric acid, HNO 3. HNO3 (aq) → H+ (aq) + NO3– (aq)

  3. Strong and weak acids of the same concentrations react differently with reactive metals. This is because the concentration of H + is greater in strong acids compared to weak acids. The greater H + concentration means that more H 2 gas is produced in a shorter time. The diagram shows the reaction of 0.1 mol dm-3 of a strong acid (HCl) with Mg.

  4. History. Past Papers. OCR. Revision notes on Strong & Weak Acids for the AQA GCSE Chemistry syllabus, written by the Chemistry experts at Save My Exams.

  5. Weak acids. Only partially ionise in water, meaning that not all of the acid molecules break up to form H + ions. Most acids are weak acids. All acids ionise (become ions) in aqueous solutions. The strength of an acid is determined by how much it ionises in water. The strength of an acid is NOT the same as the concentration of an acid!

  6. CH 3 COOH (aq) → H +(aq) + CH 3 COO -(aq) The ionic concentration = 2 x 0.00135 = 0.0027 mol dm -3. The ionic concentration of the strong acid is approximately 74 times that of the weak acid. top. Reaction rates. Similarly, the rate of reaction will reveal the strength of an acid.

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  8. Weak acids. In aqueous solutions, weak acids only partially ionise, so the solution is less acidic than with strong acids. Below are some examples of weak acids: Ethanoic acid: CH3COOH (aq) ⇌ H⁺ (aq) +CH3COO⁻ (aq) Carbonic acid: H2CO3 (aq) ⇌ H⁺ (aq) + HCO3⁻ (aq) We can identify a weak acid by the reversible reaction symbol (⇌ ...

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