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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 ...
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)
A strong acid and a weak acid of the same concentration. will react at different rates with the same metal. You can see the difference between a strong acid and a weak acid. of the same concentration by looking at the reaction with magnesium. The strong acid reacts faster and you see more bubbles of hydrogen.
Sep 16, 2022 · Strong and Weak Acids. Except for their names and formulas, so far we have treated all acids as equals, especially in a chemical reaction. However, acids can be very different in a very important way. Consider HCl(aq). When HCl is dissolved in H 2 O, it completely dissociates into H + (aq) and Cl − (aq) ions; all the HCl molecules become ions:
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!
Ethanoic acid is a typical weak acid. It reacts with water to produce hydroxonium ions and ethanoate ions, but the back reaction is more successful than the forward one. The ions react very easily to reform the acid and the water. At any one time, only about 1% of the ethanoic acid molecules have converted into ions.
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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.
