Acids and alkalis
Now look at a typical exam question. Use the information above to help you. Look at the answer after you have tried the question.
The grid shows some statements which can be applied to different solutions.
|A||Turns universal indicator blue|
|B||It has a pH less than 7|
|C||It conducts electricity|
|D||It produces chlorine gas when electrolysed|
|E||The concentration of H+(aq) ions in solution is equal to the concentration of OH-(aq) ions in solution|
a) Identify the statement(s) that can be applied to both dilute hydrochloric acid and dilute sulphuric acid.
Hint: You have not been told how many correct answers there are. However there will be no more than 2 correct answers.
b) Identify the statement that can be applied to sodium chloride solution but not to dilute hydrochloric acid.
Hint: You have been told that there is only one correct answer.
a) B, C
Both hydrochloric acid and sulphuric acid have a pH less than 7. Dilute acids conduct electricity.
Both solutions will conduct electricity as they contain ions. All acids contain H+(aq) ions in solution.
Sodium chloride is a neutral solution with a pH of 7. In neutral solutions, and pure water, the concentration of H+(aq) ions is equal to the concentration of OH-(aq) ions.
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