What is the pH value of a neutral solution?
1
7
14
Which of the following solutions could have a pH of 12?
Sodium chloride
Sulfuric acid
Sodium hydroxide
What is the formula of the ion produced by acids in aqueous solution?
OH–
H+
H–
How do the concentrations of ions in an alkaline solution compare to pure water?
The alkali contains more hydroxide ions (OH–)
The alkali contains more hydrogen ions (H+)
The alkali and pure water contain the same concentration of hydrogen ions (H+) and hydroxide ions (OH–)
How does diluting an acid with water affect its pH?
The pH decreases towards 7
The pH increases towards 7
It has no effect on the pH
A small amount of hydrochloric acid is dissolved in a large volume of water. What is the best description of this solution?
A dilute solution of a weak acid
A weak solution of a strong acid
A dilute solution of a strong acid
Which of these is a neutralisation reaction?
Acid + base
Acid + salt
Alkali + base
What does it mean when a chemist says that an acid dissociates in water?
The acid breaks up into ions
The acid dissolves
The acid heats up the water
Based on the graph, can you give the volume of potassium hydroxide required to neutralise the acid?
30 cm3
25 cm3
20 cm3
From the graph, how would you describe how the pH and acidity of rainwater changes between 1992 and 2010?
The pH increases, and the acidity increases
The pH decreases, and the acidity decreases
The pH increases, and the acidity decreases