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Acids in Everyday Life

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Paulina Dukala

on 31 May 2010

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Transcript of Acids in Everyday Life

Acids in everyday life Acids in the air-acid rain 1. fuels burn CO2 & SO2 are produced 2. H2O(water vapour,rain) + CO2,SO2 H2SO3(sulphurous acid), H2CO3(carbonic acid) severe(bad) effects caused by the acid rain on:
~stone works( e.g. statue )
Acids in the body pH 2 in the stomach helps to break down foods( proteins & carbohydrates )

~proteins peptides and amino acids
~carbohydrates glucose

the pH of blood - 7.4

Acids in the home
~citric acid is in cirtus fruits as e.g. oranges, lemons, pineapples, grapefruit
~acetic acid is in vinegar - tomato sauce, brown sauce, mint sauce CO2 in:
soda water
lemonade Acids in the soil pH of soil is about 4-8 (most soils have a pH 6.5-7.5)

examples of alkaline soil:
chalk areas
limestone areas
examples of acidic soil:
moorland areas
sandstone areas
forested areas
for gardening & farming purposes the best results from a neutral, slighty acidic soil of pH 6.5- 7.0 *rhododendrons & azaleas - can grow well in acidic soil when the soil is too acidic ?
treatment with:
-powdered limestone( calcium carbonate )
-slaked lime ( calcium hydroxide )
*these substances above are called "bases" carbohydrates rhododendron citrus fruits azaleas vinegar pineapple coke proteins Properties of acids What do we know about acids already? 1. they are soluble in water and they produce solutions with a pH below 7
2. they give characteristick colours with indicators
3. they react with metals (above copper in the reactivity series to form salt and hydrogen)
4. they react with metal oxides to form a salt and water
5. they react with corbonates to give a salt plus carbon dioxide and water
6. they conduct electricity * solution of acids consist of ions all acids produce hydrogen

at the cathode during electrolysis all acids contain H+ ions The part of water in acidity ~substances which we call acids do not behave as acids in the abscence water (without water)
~water reacts with substances to produce the H+ (aq) ions which cause acid properties
metal + acid = salt + hydrogen
Mg + H2SO4 = MgSO4 + H2 metal oxide + acid = salt + water
CuO + H2SO4 = CuSO4 + H2O carbonate + acid = salt + CO2 + H2O
(węglan) acids - substances which can give H+ ions
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