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Neutralisation D. Crowley, 2008
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Saturday, April 21, 2018 Neutralisation To understand neutralisation
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Acid Or Alkali Are the following acids or alkalis? Hydrochloric (HCl)
Sodium hydroxide (NaOH) Sulphuric (H2SO4) Nitric (HNO3) Ammonium hydroxide (NH4OH) Toothpaste Lemon juice Oven cleaner Stomach fluid Indigestion tablets Acid (Hydrochloric acid) Alkali Acid (Sulphuric acid) Acid (Nitric acid) Alkali Alkali Acid Alkali Acid (Stomach acid) Alkali
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Acid + Alkali What happens when we mix and acid and alkali?
Mixing an acid and alkali results in a chemical reaction, forming new products…
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Neutralisation The chemical reaction between an acid and alkali is called neutralisation Acid Alkali Salt + Water If you add just the right amount of acid and alkali together a neutral solution is formed (the pH value gets close to pH 7 - neutral)
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Experiment Your task is to see if you can undertake a neutralisation reaction In a boiling tube add a small amount of acid Using a pipette add one drop of alkali at a time, until you produce a neutral solution
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Chemical Reaction Acid Alkali Salt Water
The chemical reaction between an acid and alkali is: - Acid Alkali Salt Water
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Stings A bee sting is acidic A wasp sting is alkaline
Why can bicarbonate of soda (pH 9) be used to treat a bee sting? Why can vinegar (pH 3) be used to treat a wasp sting? Adding just the right amount of acid or alkali to the sting causes it to neutralise!
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