1. Stomach ache can be caused by the body making too much alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed acid.

2a. Indigestion medicines called an alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed can be taken to neutralise the over acidity in the stomach.
2b. However, they must not be too strongly alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed or they may be harmful.
2c. A simple test would be to add the medicine to universal indicator and if it turns alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed it may be harmful!
2d. An of a example of 'harmful' alkali is alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed which is used in bleach.
2e. An example of a harmless alkali would be sodium alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed.

3a. You can test how good an indigestion powder is by adding alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed quantities of different powders to the same volume of an acid to make it a alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed test.
3b. Universal indicator is added and as the powder is added the colour changes from alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed to alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed when the acid has all been neutralised.

4a. When an alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed is added to an acid the pH is alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed.
4b. If solutions of an acid and an alkali of the same concentration are alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed, it will take alkalialkalineantacidbicarbonateequalfairgreenhydrochlorichydroxideincreasedmixedredsodiumvioletweighed volumes of each to get the perfect neutralisation.