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Strong acids and bases are good conductors of electricity. They conducts electricity in aqueous solution. Reaction between acids and bases : Reaction between acids and bases to form salt and water is known as neutralisation reaction. For ex. HCl + NaOH ——> NaCl + H2O.

Some naturally occurring acids are : lemon contains citric acids, apple contains malic acid, tomato contains oxalic acid, tamarind contains tartaric acid, milk contains lactic acid etc.

Sorry, but there is no system of uploading image here, that's why I am going to write all the important things about this chapter.. Acids : Those substances which releases hydronium or hydrogen ions on dissolving in water, For ex: HCl + H2O——> H3O+ and Cl-... Bases: Those substances which releases hydroxide ions on dissolving in water, For ex: NaOH+ H2O ——> Na+ and OH- These were arrhenius acid and base theory. Acids are the substances which are sour in taste, turns blue litmus red and releases hydronium ions in water, while bases are the substances which are bitter in taste , turns red litmus blue and releases hydroxide ions in water. Acids and bases are actually the nature of substances, elements or compounds. They can be classified on different basis: 1.On the basis of origin : Organic acid: Acids which are obtained from living things. For ex. From animals or plants. Minerals acid: Acids which are obtained from the minerals of earth . For ex. From rocks or minerals etc. 2.On the basis of strength: Strong acid: Acids which ionises completely in water, for ex. HCl, H2SO4 etc. Weak acid: Acids which does not ionises completely in water, ex. CH3COOH, (COOH)2, HCOOH etc. 3.on the basis of hydronium ions: Concentrated acid: Acids which have more concentration of hydronium ions and less concentration of water, ex. HCl(conc.) Diluted acid: Acids which have more concentration of water and less concentration of hydronium ions, ex. HCl(dil.) Indicators:The substances which detects the nature of substances whether they are acidic or basic in nature. They can be classified among four groups: Natural, synthetic, olfactory and universal Natural indicator: Those indicators which are obtained from nature, ex. Litmus paper, turmeric, red cabbage etc. Synthetic indicators: Those indicators which are synthesised in laboratory, ex. Methyl orange, phenolpthalein etc. Olfactory indicators: Those indicators which change their odour in presence of acids and bases. Ex. Onion, clove oil, vanilla etc. Universal indicators: Those indicators which does not detect only nature of chemical but also detect their strength, ex. pH paper.