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Acid Explosion Summary.

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Presentation on theme: "Acid Explosion Summary."— Presentation transcript:

1 Acid Explosion Summary

2 Boardworks KS3 Science 2008 Acids and Alkalis
The litmus test Teacher notes A is alkaline B is acidic C is neutral

3 What is universal indicator?
Boardworks KS3 Science 2008 Acids and Alkalis What is universal indicator? Universal indicator has a range of colours that show how weak or strong the acid or alkali is. weak alkali weak acid strong acid neutral strong alkali What is the colour for a weak acid? What is the colour for a strong alkali? Universal indicator is made from a mixture of indicators. Why do you think it is more useful than litmus?

4 Mixing acids and alkalis
Boardworks KS3 Science 2008 Reactions of Acids Mixing acids and alkalis

5 What is neutralization?
Boardworks KS3 Science 2008 Reactions of Acids What is neutralization? The chemical reaction between an acid and an alkali is called neutralization. What is the pH value of the mixture of salt and water? + acid alkali salt + water The mixture of salt and water is neutral, so its pH is 7. The chemical reaction between an acid and an alkali can be written as: + acid alkali salt + water

6 Boardworks KS3 Science 2008 Reactions of Acids
Making salts The salt produced by a neutralization reaction depends on the acid and the alkali used. Sodium chloride is produced by the reaction between hydrochloric acid and sodium hydroxide. hydrochloric acid sodium hydroxide sodium chloride + + water Which acid and which alkali would be needed to make the salt potassium chloride? hydrochloric acid potassium hydroxide potassium chloride + + water

7 Boardworks KS3 Science 2008 Reactions of Acids
Naming salts When an alkali reacts with hydrochloric acid, the salt produced is a chloride. When an alkali reacts with sulfuric acid, the salt produced is a sulfate. When an alkali reacts with nitric acid, the salt produced is a nitrate. Which acid would be needed to make these salts? copper nitrate magnesium chloride sodium sulfate

8 Boardworks KS3 Science 2008 Reactions of Acids
Neutralizing stings Bee stings are acidic. Wasp stings are alkaline. Photo credit (left and right): © 2008 Jupiterimages Corporation Which safe household substances could you use to treat a bee sting? Which safe household substances could you use to treat a wasp sting?

9 Boardworks KS3 Science 2008 Reactions of Acids
Indigestion remedies The acid in your stomach that helps you break down your food is called hydrochloric acid. It has a pH of between 1 and 2. Indigestion and heartburn are caused by an excess of acid in your stomach. Indigestion remedies such as Milk of Magnesia contain antacids, like magnesium oxide and calcium carbonate. Photo credit: © 2008 Jupiterimages Corporation What do you think antacids do to the acid in your stomach?

10 Boardworks KS3 Science 2008 Reactions of Acids
Acid and carbonate When a carbonate reacts with an acid, it gives off carbon dioxide gas. How could you test the gas given off, to confirm that it is carbon dioxide? What would you observe in this test? carbon dioxide limewater

11 Boardworks KS3 Science 2008 Reactions of Acids
Acid and metal Acids also react with metals to make a gas. When an acid reacts with a metal, the gas produced makes a lighted splint go pop. What is this gas? A salt is also produced during the reaction. What is the name of the salt that will be produced by the reaction of hydrochloric acid with calcium? Reactions of Acids Worksheet 1 accompanies this slide. Teacher notes The gas produced during the react between an acid and a metal is hydrogen. hydrochloric acid calcium chloride + calcium + hydrogen


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