Question 3.3.1: What is the effect of different substances on the color change of lime water?
Question 3.3.2: If various substances are added to lime water, then the color of the lime water will change depending on the acidity or basicity of the substance.
Question 3.3.3: The soda-lime and sodium hydroxide are used to provide a controlled environment in the investigation. The soda-lime is used to absorb any carbon dioxide present in the air, preventing it from affecting the results. The sodium hydroxide is used as an indicator to show a change in pH when the substances are added to the lime water.
Question 3.3.4: Test tube A is considered the control of the investigation.
Question 3.3.5: The lime water in test tube D turned milky due to the formation of calcium carbonate when carbon dioxide was introduced. This happened because carbon dioxide reacted with the calcium hydroxide in the lime water to form insoluble calcium carbonate, causing the solution to turn milky.
Study the investigative setup below and answer the questions that follow.
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Question 3.3.1 [2 marks]
Write an investigative question for this investigation.
Question 3.3.2 [2 marks]
Write a suitable hypothesis for this investigation.
Question 3.3.3 [2 marks]
What does the soda-lime and sodium hydroxide do?
Question 3.3.4 [1 mark]
Which test tube is considered the control of the investigation? Question 3.3.5 [2 marks]
What happened to the lime water in test tube D? Why did this happen?
[9 marks]
1 answer
1 answer