A student tests some substances found in the home with universal indicator.
The table shows the student's results.
| Substance | pH |
|---|---|
| lemon juice | 2 |
| vinegar | 3 |
| pure water | 7 |
| baking soda solution | 9 |
| oven cleaner | 13 |
Give the name of the substance in the table that is neutral.
Give the name of the substance in the table that is the most alkaline.
Acids are a source of one type of ion in solution. Give the formula of this ion.
Alkalis are a source of a different type of ion in solution. Give the name of this ion.
The student then tests the substances with other indicators.
Give the colour of phenolphthalein in oven cleaner.
Give the colour of methyl orange in lemon juice.
44 exam-style questions on Edexcel GCSE Chemistry 4.1 Acids, covering 4.1.1 Acids, alkalis and the pH scale, 4.1.2 Hydrogen ion concentration and pH, 4.1.3 Dilute and concentrated, weak and strong acids, 4.1.4 Bases, alkalis and the reactions of acids, 4.1.5 Chemical tests for hydrogen and carbon dioxide, 4.1.6 Neutralisation as a reaction of acids with bases, 4.1.7 Preparing soluble salts, and 4.1.8 Solubility rules and preparing insoluble salts. Each one has a worked solution and a mark scheme showing where the marks go.