Calderglen High School
Chemistry Homework 2 – Acids & Bases
1.
Name the two ions formed when a water molecule dissociates.
2.
Identify the oxide which, when added to water, produces a solution with a greater concentration
of hydroxide ions (OH-) than hydrogen ions (H+).
3.
Identify the two statements which are correct for an alkaline solution.
A
B
C
D
4.
It has a pH less than 7.
It conducts electricity.
It contains less OH–(aq) ions than pure water.
When diluted the concentration of OH–(aq) ions decreases.
When sulfur dioxide dissolves in water in the atmosphere “acid rain” is produced.
Circle the correct phrase to complete the sentence.
a higher
Compared with pure water, acid rain contains
a lower
concentration of hydrogen ions.
the same
5.
A solution of 0·1 mol l -1 hydrochloric acid has a pH of 1.
(a) What colour would universal indicator turn when added to a solution of hydrochloric acid?
(b) Starting at pH 1, draw a line to show how the pH of this acid changes when diluted with water.
Calderglen High School
Chemistry Homework 2 – Acids & Bases
6.
Lemon juice contains citric acid.
Complete the sentence below by circling the correct answer.
When lemon juice is diluted with water the pH
decreases
stays the same
increases
7.
Identify the correct statement which describes the effect of diluting an acid with water.
8.
Circle the correct phrase to complete the sentence.
a higher
9.
Compared with pure water, an alkaline solution contains
a lower
of hydroxide ions.
the same
concentration
Identify the correct statement which describes the effect of adding water to an alkaline solution.