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pH scale and universal indicator solution

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Lesson details

Lesson outcome

Waxaan cabbiri karaa pH-ga aashito ama alkali iyadoo la isticmaalayo miisaanka pH.

Introduction

In this lesson: I can measure the pH of an acid or alkali using the pH scale. Most acids and alkalis are colourless solutions, so indicators can be used to identify them. pH stands for ‘potential of hydrogen’ and acids contain hydrogen.

Show transcript
Most acids and alkalis are colourless solutions, so indicators can be used to identify them. pH stands for ‘potential of hydrogen’ and acids contain hydrogen. The higher the concentration of hydrogen, the lower the pH. The pH scale goes up and down in factors of ten, so an acid of pH 2 is ten times more acidic than pH 3. A low pH means acidic, a high pH means alkaline and solutions with a pH of 7 are neutral.

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Quizzes

  1. 1. Which of these statements about chemical reactions are true?

    • Correct answer:New products are made when a chemical reaction occurs.
    • New reactants are made when a chemical reaction occurs.
    • Correct answer:The total mass of reactants is the same as the total mass of the products.
    • No new substances are formed when a chemical reaction occurs.

  2. 2. What is the result if blue litmus paper is dipped into lemon juice?

    • It stays blue.
    • Correct answer:It turns red.
    • It turns green.
    • It turns yellow.

  3. 3. What is the result if red litmus paper is dipped into soapy water?

    • Correct answer:It turns blue.
    • It stays red.
    • It turns green.
    • It turns yellow.

  4. 4. True or false? Vinegar can be used to neutralise sodium hydroxide.

    • Correct answer:true
    • false

  5. 5. Which containers of liquid may require a corrosive hazard label?

    • water
    • milk
    • Correct answer:sulfuric acid
    • Correct answer:sodium hydroxide (an alkali)

  1. 1. A bee sting is acidic. What colour would universal indicator turn?

    • blue
    • green
    • Correct answer:red
    • purple

  2. 2. What does pH stand for?

    • Correct answer:potential of hydrogen
    • potential of hydroxide
    • potential of helium
    • potential of harm

  3. 3. Select the correct statements about concentration of hydrogen and pH.

    • Correct answer:The higher the concentration of hydrogen, the lower the pH.
    • The higher the concentration of hydrogen, the higher the pH.
    • Correct answer:The lower the concentration of hydrogen, the higher the pH.
    • The lower the concentration of hydrogen, the lower the pH.

  4. 4. Solution A has a pH of 8 and solution B has a pH which is 1000 times more alkaline. What is the pH of solution B?

    • Correct answer:11
    • 10
    • 9
    • 7

What pupils see

The same lesson as a pupil sees it. You can set any section as work on its own.

  • IntroductionPrepare
  • Starter quizActivate · 5 questions
  • Lesson videoLearn
  • Exit quizCheck · 4 questions
This content is by Cashar and published under an open licence.