Question

5. Part of the pH scale is shown.
The pH scale
7 B 9 10 lg 1
Cestic
Neutra
Some of these experiments involve a pH change.
A sodium chloride (common salt) is dissolved in pure water
B carbon dioxide gas is dissolved in pure water
Csodium hydroxide solution is neutralised by adding dilute hydrochloric acid
D excess sodium hydroxide solution is added to a weakly acidic solution
E ammonia gas is dissolved in pure water
The table shows the pH at the start and at the end of the five experiments.
Complete the table by inserting the appropriate letter in each box. You may use each letter
only once.
The first one has been done for you.
pH at the end
14
Experiment
D
pH at start
5
7
7
14
7
7​

Answer 1

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