Science : Ch 02 – Acids Bases and Salts

The increasing order of acid strength is water < acetic acid < hydrochloride acid. Hydrochloride acid is a strong acid and ionises fully in water.

Phenolphthalein solution is a colourless indicator which gives pink colour in basic solution. Phenolphthalein solution remains colourless in acidic solution as well as in neutral solution.

Clove oil is an olfactory indicator. These the substances which give one type of odour in acidic medium and a diferent odour in basic medium so a visually challenged student favours to use clove oil as an acid-base indicator.

If 10 ml of H₂SO₄ is mixed with 10 ml of Mg(OH)₂ of the same concentration, the result solution be MgSO₄ which is a neutral salt and universal indicator will give the green colour in this solution

The tooth paste commonly used is alkaline or basic in nature as they contain mild bases such as sodium fuoride or sodium bicarbonate in their composition.

Acids turn blue litmus solution to red. They have a sour taste as in the case of vinegar and are sticky to touch. On the other hand, bases turn red litmus solution to blue. Bases are bitter in taste as in the case of baking soda and are slippery to touch.

Common salt (NaCl) is formed after a reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)