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BASES AND INDICATORS

Chemistry

INTRODUCTION TO ACIDS, BASES AND INDICATORS

. In a school laboratory: (i) An acid may be defined as a substance that turns litmus red. (ii) A base may be defined as a substance that turns litmus blue. Litmus is lichen found mainly in West Africa. It changes its colour depending on whether the solution is in basic/alkaline or acidic. It is thus able to identify/show whether another substance is an acid, base or neutral. (iii) An indicator is a substance that shows whether another substance is a base/alkaline, acid or neutral. Common naturally occurring acids include: Most commonly used acids found in a school laboratory are not naturally occurring. They are manufactured. They are called mineral acids. Mineral acids are manufactured to very high concentration. They are corrosive (causes painful wounds on contact with the skin) and attack/reacts with garments/clothes/metals.   In a school laboratory, they are mainly used when added a lot of water. This… Read More »INTRODUCTION TO ACIDS, BASES AND INDICATORS

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