Chemistry - 4CH1 PearsonEdexcel

Acids, Alkalis And Titrations

Bayani Gaba-gaba

From the sting of a wasp to the fizz of a dissolving antacid tablet, acids and alkalis are at work everywhere. Understanding what makes a substance acidic or alkaline, and knowing how to measure and neutralise that character, is one of the most practical skills chemistry offers.

In this lesson you will learn how indicators reveal pH, why acids produce hydrogen ions while alkalis produce hydroxide ions, and how a titration lets you find the exact volume of one solution needed to neutralise another. These ideas run through Edexcel Paper 1 and Paper 2 every session.

Manufura

  1. describe the use of litmus, phenolphthalein and methyl orange to distinguish between acidic and alkaline solutions
  2. understand how to use the pH scale, from 0-14, can be used to classify solutions as strongly acidic (0-3), weakly acidic (4-6), neutral (7), weakly alkaline (8-10) and strongly alkaline (11-14)
  3. describe the use of universal indicator to measure the approximate pH value of an aqueous solution
  4. know that acids in aqueous solution are a source of hydrogen ions and alkalis in a aqueous solution are a source of hydroxide ions
  5. know that alkalis can neutralise acids
  6. describe how to carry out an acid-alkali titration

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Takardar Darasi

You cannot see whether a solution is acidic or alkaline just by looking at it. Hydrochloric acid and water can both appear as colourless liquids, yet one will corrode metal while the other is safe to drink. Chemists solved this problem centuries ago with indicators, coloured dyes that change hue in response to acidity. Today, the pH scale gives us a single number that captures how acidic or alkaline a solution is, and titrations let us measure concentrations with precision.

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Barka da kammala darasi akan Acids, Alkalis And Titrations. Yanzu da kuka bincika mahimman ra'ayoyi da ra'ayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

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  1. Which indicator turns pink in alkaline solution and is colourless in acid? A) Litmus B) Methyl orange C) Phenolphthalein D) Universal indicator Answer: C
  2. A solution has a pH of 2. It is best described as: A) Weakly acidic B) Strongly acidic C) Neutral D) Weakly alkaline Answer: B
  3. Which ion is responsible for making a solution acidic? A) OH- B) Na+ C) H+ D) Cl- Answer: C
  4. What is produced when an acid reacts with an alkali? A) Salt and hydrogen B) Salt and water C) Salt, water and carbon dioxide D) Salt and oxygen Answer: B
  5. In a titration, concordant results are readings that agree within: A) 1.0 cm3 B) 0.5 cm3 C) 0.1 cm3 D) 0.01 cm3 Answer: C

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