Acids and alkali- Neutralisation Research TASK: Use your own knowledge and the internet to complete each PPT slide l_material_behaviour/acids_bases_metals/revise1.shtml

List 5 everyday acids and alkali (5 of each) AcidsAlkali Washing powder

Distilled water (pure) Sodium hydroxide Hydrochloric acid egg soap

What would happen to the pH value if more acid was added to the mixture? Answer:_______________________________________ If the right amounts of an acid and an alkali are added together the pH of the mixture changes to neutral (pH 7). This reaction is neutralisation. 7E Neutralisation - What is neutralisation? What would happen to the pH value if more alkali was added to the mixture? Answer:_______________________________________ acid + alkali neutral solution Read his slide, and answer the question

1)What should I add to neutralize the bee sting? Add alkali, toothpaste, washing up powder 2) What should I add to neutralize the wasp sting? Add acid. Vinegar, lemon juice A bee sting is acidic. A wasp sting is alkaline. Complete the questions

Neutralisation reactions The reaction between an acid and alkali produces salt and water Acid +alkalisalt + water Hydrochloric acid Sodium hydroxide Re arrnage these words and to show a word equation for an example of a neutralisation reaction Sodium Chloride water + + H2O NaOH NaCl HCl Re arrnage these chemical formula to show a symbol equation for an example of a neutralisation reaction + +

Research, the uses of neutralisation reactions On each of the following slides, research how neutralisation reactions are used Use pictures and diagrams to help you explain the application of neutralisation reactions DO NOT COPY AND PASTE, summarise using your own words in 1 or 2 sentences.

Treating stomach acid Neutralise stomach acid with alkali tablets (indigestion tablets)

Toothpaste Toothpaste neutralises acid in the mouth

Soil treatment- Farming

Your choice, research another use of neutralisation reactions

True or false 1). All acids are safe 2). If a substance has a pH of 7, it is neutral 3). Pineapple juice is acidic 4). Bleach is alkaline 5). All acids taste sour 6). Alkalis feel soapy 7). When an alkali is added to acid it is neutralised 8). All acids burn through things 9). Some substances are acidic and alkaline at the same time 10). Strong acids are corrosive 11). Pure water is alkaline 12). All neutral solutions are harmless 13). Acids have a pH greater than 7 14). Acids can dissolve metals 15). Lemon juice contains citric acid Complete these summary True/false statements