2 Boardworks KS3 Science 2008 Acids and Alkalis The litmus testTeacher notesA is alkalineB is acidicC is neutral
3 What is universal indicator? Boardworks KS3 Science 2008Acids and AlkalisWhat is universal indicator?Universal indicator has a range of colours that show how weak or strong the acid or alkali is.weak alkaliweak acidstrong acidneutralstrong alkaliWhat 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 2008Reactions of AcidsMixing acids and alkalis
5 What is neutralization? Boardworks KS3 Science 2008Reactions of AcidsWhat 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?+acidalkalisalt + waterThe 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:+acidalkalisalt + water
6 Boardworks KS3 Science 2008 Reactions of Acids Making saltsThe 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 acidsodium hydroxidesodium chloride++waterWhich acid and which alkali would be needed to make the salt potassium chloride?hydrochloric acidpotassium hydroxidepotassium chloride++water
7 Boardworks KS3 Science 2008 Reactions of Acids Naming saltsWhen 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 nitratemagnesium chloridesodium sulfate
10 Boardworks KS3 Science 2008 Reactions of Acids Acid and carbonateWhen 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 dioxidelimewater
11 Boardworks KS3 Science 2008 Reactions of Acids Acid and metalAcids 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 notesThe gas produced during the react between an acid and a metal is hydrogen.hydrochloric acidcalcium chloride+calcium+hydrogen