Worksheet: The pH Scale
In this worksheet, we will practice defining pH as a logarithmic measure of acid concentration and using it to determine the relative acidity or basicity of a substance.
Ocean water has a pH of 8. Is it acidic, basic, or neutral?
Milk of magnesia has a pOH of 3.5. Is it acidic, basic, or neutral?
Orange juice has a pOH of 9.8. Is it acidic, basic, or neutral?
In which range of values would the pH of a basic solution be found?
Is a solution of pH 6.9 acidic, basic, or neutral?
In which range of values would the pH of an acidic solution be found?
Is a solution of pH 3.2 acidic, basic, or neutral?
What is the pH of a neutral solution at room temperature?
Calcium carbonate will produce a fizz of carbon dioxide when added to lemon juice. Based on this observation, what can be said about the pH of lemon juice?
Which of the following pH values would a solution of lemon juice most likely have?
How can an indicator be used to estimate the pH of a solution?
- AAn indicator will turn from a solid to a liquid in basic solutions.
- BAn indicator will make a “squeaky pop” noise in acidic solutions.
- CAn indicator will change color above or below a specific pH range.
- DAn indicator can measure the exact concentration of ions in an aqueous solution.
- EAn indicator will give off a different gas depending on whether a solution is acidic or basic.
Fill in the blank: pH is a measurement of the concentration, in an aqueous solution, of .
- A molecules
- B ions
- D atoms
- E ions
A few drops of universal indicator were added to four flasks containing unknown solutions. Which of the following values provide the best estimate for the pH of each solution?
- AA = 11, B = 1, C = 5, and D = 7
- BA = 5, B = 7, C = 11, and D = 1
- CA = 5, B = 1, C = 11, and D = 7
- DA = 1, B = 11, C = 7, and D = 5
- EA = 7, B = 11, C = 5, and D = 1
In an experiment, a solution of 1 M was placed into a beaker. Powdered was added to the beaker at regular intervals and the pH was continually measured. Which of the graphs shows how the pH would change during this experiment?
The table below shows the relationship between pH and the concentration of ions in an aqueous solution. What is the value of ?
|Concentration of ions/mol⋅dm−3||0.1||0.01||0.0001||0.00001|
Which of the following diagrams represents a correctly labeled pH scale?
Which of the following descriptions explains how litmus paper can be used to test for acids?
- AAcids turn blue litmus paper red.
- BAcids keep blue litmus paper blue.
- CAcids turn red litmus paper blue.
- DAcids turn red litmus paper purple.
- EAcids turn blue litmus paper purple.
An acidic solution was found to have a pH of 1. Upon the addition of a small volume of a base, the pH changed to 3. By what factor has the concentration of ions changed?
- AIncreased by a factor of 2
- BDecreased by a factor of 10
- CDecreased by a factor of 100
- DIncreased by a factor of 100
- EDecreased by a factor of 2
Fill in the blanks: Litmus is a mixture of dyes extracted from lichen. It can be used to detect if solutions are acidic or basic. It is in acidic solutions and in basic solutions.
- Ared, blue
- Bcolorless, pink
- Cgreen, blue
- Dpink, colorless
- Eblue, red
Which of the following represents the colour of litmus paper in a neutral medium?
Which of the following statements about the relationship between and and the value of pH is correct?
- AIf the concentration of , the solution is basic and the value of pH is less than 7.
- BIf the concentration of , the solution is acidic and the value of pH is greater than 7.
- CIf the concentration of , the solution is acidic and the value of pH is less than 7.
- DIf the concentration of , the solution is basic and the value of pH is less than 7.