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Acids and Alkali. By: See Tow Ting Yang (1A222) Reinvs Loh (1A216) Andrew Tan (1A225). Agenda. What are acids? What are alkalis? Litmus paper Reactions Indicator. What are acids?. Properties of acids -Sour taste -Able to conduct electricity -Corrosive if concentrated
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Acids and Alkali By: See Tow Ting Yang (1A222) ReinvsLoh (1A216) Andrew Tan (1A225)
Agenda What are acids? What are alkalis? Litmus paper Reactions Indicator
What are acids? Properties of acids -Sour taste -Able to conduct electricity -Corrosive if concentrated -Able to turn litmus paper red -Reacts with metals, carbonate compounds and alkali -Forms an aqueous solution when in water
What are alkalis? Properties of alkalis -Soapy feeling -Turns litmus paper blue -Conducts electricity -Corrosive when concentrated -Reacts with acids to form salt and water -Forms an aqueous solution when in water
Litmus paper It is a piece of paper that shows whether the liquid is acidic or alkaline. When reacts with acids, it turns red. When in contact with a alkali, it turns blue.
Reactions-Acid Common examples of acids
Reaction-Acid Reaction with metals Acid + Metal Salt + Hydrogen
Examples • Magnesium + Sulphuric acid Magnesium Sulfate + Hydrogen • Sodium + Nitric acid Sodium nitrate +hydrogen • Potassium + Hydrochloric acid Potassium chloride + Hydrogen
Reaction-Acid Reaction with carbonates Acid + Carbonate Salt + Carbon dioxide + Water
Examples • Lithium carbonate + sulphuric acid lithium sulphate + Carbon dioxide + water • Calcium carbonate + nitric acid calcium nitrate + carbon dioxide + water
Other ways to test acids • A lighted splint -Gives a ‘pop’ sound when in contact with hydrogen • Limewater -Turns chalky when there is a presence of carbon dioxide
Reaction-Alkali Reacts with acids to neutralize Acid + Alkali Salt + Water
Examples • Sodium Hydroxide + Sulphuric acid Sodium sulphate + water • Potassium hydroxide + nitric acid Potassium nitrate + water
Purpose Used to differentiate acids and alkali without having to have reactions with carbonates etc. Shows different colours in different pH values of soultions
Videos! • Acids and HCl http://www.youtube.com/watch?v=ECmNO0VMSgo
Credits Edumore Google Wiki answers Yahoo answers Youtube
Thank you Any questions?