Chemistry-acids and bases(neutralisation reactions)

Neutralisation reactions
A neutralisation reaction takes place when an acid and base react together. The reaction is given below. acid + base => salt + water
Salt (sodium chloride) can be produced by reacting sodium hydroxide, a known base, with hydrochloric acid.
Follow the procedure outlined below.
You will need: -1M Sodium hydroxide -1M Hydrochloric acid -evaporating crucible -universal indicator -measuring cylinder -dropper -glass stirring rod
Measure 5 mls of sodium hydroxide ( a strong base) and place it in the evaporating crucible. Add one drop of universal indicator.
Using a dropper, add 1M hydrochloric acid, drop by drop stirring constantly with a glass stirring rod.
When the universal indicator turns green heat the crucible strongly with a bunsen burner. The salt can be seen depositing in the crucible as the water evaporates.
Click to see a 120kb video of the universal indicator changing colour when added to sodium hydroxide. What colour change indicates a strong base? Click to see a 120kb video of hydrochloric acid been added to the sodium hydroxide. What colour change indicates an acid? Why does the solution turn green when the acid is mixed into the sodium hydroxide solution?
Irene was adding hydrochloric acid to the sodium hydroxide solution, slowly, drop by drop when the solution turned yellow as shown on the right. Why did the solution turn yellow rather than green?
Some antacid tablets and powders contain bases such as magnesium hydroxide and aluminium hydroxide. These bases neutralise the acid in the stomach. Describe how the pH of the stomach fluid changes as the antacid tablet or powder dissolves. What are the products of the reaction between hydrochloric acid and the bases magnesium hydroxide and aluminium hydroxide?
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