Question

(a) What is an alkali? Give an example.
(b) Why do HCl, HNO3, etc. show acidic characters in aqueous solutions while solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Answer 1

Answer:

hey mate your answer here...

Explanation:

a). the metals which for hydroxide on reacting with water are termed as alkali metals.

b) HCL,HNO3 shows characters because they liberate hydronium (H3O+) ions in aqueous solution while compounds like alcohol and glucose does not liberate any ions. hydronium ion is responsible for the acidic behavior of an acid.

hope that helps you....

Answer 2

(a) Alkali:

• An alkali is basic in nature.
• It is salt obtained when alkali earth metals are dissolved in water.
• The pH of alkali is greater than 7.0
• The concentrated alkali solution causes burns.
• Some of the alkali salts are not soluble in water. Aqueous acidic solutions are used to dissolve this salt.
• Alkali solutions are slippery to touch.

Example:

• Sodium hydroxide
• Potassium hydroxide
• Calcium hydroxide

(b) Acidic character:

• When HCl and HNO₃ chemicals are dissolved in water, they produces H⁺ and H₃O⁺ ions. These ions show acidic nature.
• The ionisation reaction is given below:

$H C l(a q) \rightarrow \mathrm{H}^{+}(a q)+C l^{-}(a q)$

$\mathrm{H}^{+}(a q)+H_{2} O(l) \rightarrow H_{3} O^{+}(a q)$

• When alcohol and glucose are dissolved in water, they do not produce any ions.