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Acids and Alkali

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

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  1. Acids and Alkali By: See Tow Ting Yang (1A222) ReinvsLoh (1A216) Andrew Tan (1A225)

  2. Agenda What are acids? What are alkalis? Litmus paper Reactions Indicator

  3. 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

  4. 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

  5. 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.

  6. Reactions

  7. Reactions-Acid Common examples of acids

  8. Reaction-Acid Reaction with metals Acid + Metal  Salt + Hydrogen

  9. Examples • Magnesium + Sulphuric acid  Magnesium Sulfate + Hydrogen • Sodium + Nitric acid  Sodium nitrate +hydrogen • Potassium + Hydrochloric acid  Potassium chloride + Hydrogen

  10. Reaction-Acid Reaction with carbonates Acid + Carbonate  Salt + Carbon dioxide + Water

  11. Examples • Lithium carbonate + sulphuric acid  lithium sulphate + Carbon dioxide + water • Calcium carbonate + nitric acid  calcium nitrate + carbon dioxide + water

  12. 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

  13. Reaction-Alkali Reacts with acids to neutralize Acid + Alkali  Salt + Water

  14. Examples • Sodium Hydroxide + Sulphuric acid  Sodium sulphate + water • Potassium hydroxide + nitric acid  Potassium nitrate + water

  15. Indicator

  16. Purpose Used to differentiate acids and alkali without having to have reactions with carbonates etc. Shows different colours in different pH values of soultions

  17. PH scale

  18. Videos!  • Acids and HCl http://www.youtube.com/watch?v=ECmNO0VMSgo

  19. Credits Edumore Google Wiki answers Yahoo answers Youtube

  20. Thank you Any questions?

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