pH

An acid is a substance whose pH
1. is less than 7
2. equals 7
3. is greater than or equal to 7
4. is between 1 and 5
Which of the following pHs would you expect a concentrated solution of sodium hydroxide to have?
1. 14
2. 1
3. 7
4. 3
Which one of the following pHs is that of an acid?
1. 4
2. 7
3. 8
4. 14
Ammonia is found in many household products such as window cleaner.
What is its approximate pH?
1. 10
2. Hydrogen (H₂)
3. Oxygen (O₂)
4. Nitrogen (₂)
If air is bubbled slowly through water, the pH of the water changes from 7 to 5.7.

What gas in the air is responsible for this?
1. Carbon dioxide (CO₂)
2. Hydrogen (H₂)
3. Oxygen (O₂)
4. Nitrogen (₂)
Most plants prefer soil with a pH between 6 and 8.
Soil from an area where lime-loving plants thrive was mixed with universal indicator solution.
What colour would you expect the solution to change to?
1. Green/blue, pH = 8
2. Green, pH = 7
3. Yellow, pH = 6
4. Red, pH = 3
The exact pH of a substance may be found using
1. universal indicator paper.
2. red litmus paper.
3. blue litmus paper.
4. methyl orange indicator.
A soil sample is tested for its pH, and is found to have a value of 5.5.
Which of the following substances is best added to the soil in order to neutralise it?
1. Lime
2. Citric acid
3. Diluted vinegar
4. Water
Which one of the following items would you least likely use when testing the pH of a soil sample?
1. Bunsen burner
2. Universal indicator solution
3. Test tube
4. Filter paper
Which one of the following is not a property of the pH scale?
1. It ranges from 1 to 12.
2. Acids have a low pH.
3. Bases have a high pH.
4. A pH of 7 is neutral.
Which one of the following does not measure the pH of a substance?
1. Litmus paper
2. Universal indicator
3. pH meter
Too much acid in our stomachs can cause indigestion.

What is the name given to the type of substance used to balance the pH of the acid?
1. Antacid
2. Preservative
3. Bacteria
4. Chlorine
In the Summer months, farmers produce silage which is stored for feeding cattle during the winter.

Silage generally has a pH of approximately
1. 4
2. 7
3. 11
4. 1
Which one of the following substances has a pH of 9?
1. Soap
2. Lemon juice.
3. Sulfuric acid.
4. Sodium hydroxide.
The diagram shows the pH scale.

Which of these colours would indicate the pH of vinegar?
1. Orange
2. Light green
3. Dark green
4. Light blue
The diagram shows the different colours of the pH scale.
Which set of three colours would represent a weak acid?
1. Green, lime green and lime yellow
2. Red, dark orange and orange
3. Violet, purple and dark purple
4. Turquoise, light blue and blue
Which one of the following solutions would have a pH of 12?
1. Window cleaner
2. Tap water
3. Hydrochloric acid
4. Lemon juice
Litmus paper measures the pH of a solution by a colour change.
1. False
2. True
The photo shows a device used for measuring the acidity or alkalinity of a soil sample.
It is called a
1. pH meter
2. ammeter
3. voltmeter
4. newtonmeter

pH

Multiple Choice Quiz