Practical: red cabbage indicator solution
Lesson 7 / 7
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Lesson outcome
Waxaan samayn karaa xal u dhigma oo ka sameysan kaabajka cas waxaana u isticmaali karaa in aan ku tijaabiyo xalalka si aan u ogaado inay yihiin aashito ama alkali.
Introduction
In this lesson: I can make red cabbage indicator solution and use it to test solutions to find out if they are acid or alkali. Red cabbage solution is pink or red in an acid, purple in a neutral solution, and green in an alkali. Different chemical indicators have their advantages and disadvantages.
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Quizzes
1. Which of the following statements about solvents is correct?
- Correct answer:A liquid in which a substance dissolves.
- The mixture formed when a solid dissolves in a liquid.
- The ability of a substance to dissolve in a liquid.
- A liquid in which a substance will not dissolve.
2. Which two of the following keywords can be used to describe a substance that can dissolve in a liquid?
- Correct answer:solute
- Correct answer:soluble
- solution
- solvent
3. Some pH scales have a range from 0 to 14. Which of the following would describe a substance with a pH of 0?
- Correct answer:very strong acid
- very strong alkali
- neutral
4. The pH range most commonly used is from 1 to 14. What does the term 'range' mean?
- The largest value in an experiment.
- The smallest value in an experiment.
- The sum of the maximum and minimum values.
- Correct answer:The difference between the maximum and minimum values.
1. A pupil uses red cabbage to make an indicator. The solution produced is too pale to show a colour change. How could the method to make the indicator be improved?
- Use more water and less red cabbage.
- Correct answer:Use less water and more red cabbage.
- Use less water and less red cabbage.
- Use green cabbage instead of red cabbage.
2. Which of the following describe what a mortar and pestle are used for?
- Correct answer:crushing substances
- mixing substances
- dissolving substances
- heating substances
3. Which of the following statements explain why red cabbage and litmus are less effective than universal indicator at indicating the pH of a substance?
- Correct answer:Litmus does not clearly indicate when a solution is pH 7.
- Red cabbage does not indicate when a solution is pH 7.
- Correct answer:Universal indicator turns a different colour for each pH from 1 to 14.
- Red and blue litmus are more effective as indicators of pH than red cabbage.
4. A soluble substance dissolves in a solvent. If the solvent is water, what name is given to a soluble base?
- acid
- Correct answer:alkali
- hydrogen
- neutral
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 4 questions
- Lesson videoLearn
- Exit quizCheck · 4 questions