Question

(a) State the chemical properties on which the following uses of baking soda are based:
(i) as an antacid
(ii) as a soda acid fire extiguisher
(iii) to make bread and cake soft and spongy.
(b) How is washing soda is obtained from baking soda? Write balanced chemical
equation.​

Answer 1

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Baking soda is generally mild basic in nature.

It is a chemical compound which is also called as - Sodium bicarbonate (NaHCO₃).

(a)

1. Antacid - NaHCO₃ (Sodium hydrogen carbonate/ sodium bicarbonate) acts like an absorbable antacid. Baking soda imitates the action of natural sodium bicarbonate in the body and neutralizes the stomach acid relieving acid reflux.

2. Soda-acid fire extinguisher - A soda-acid fire extinguisher is usually a mixture of baking soda and an acid which is commonly sulfuric acid. It is used as a pressurized expeller to put off the fire. When it is expelled, a reaction in between the contents of the soda-acid occurs which releases carbon dioxide that extinguishes the fire.

3. Baking - When baking soda is mixed with moisture and with an acidic substance like yogurt, buttermilk etc, a chemical reaction occurs which produces carbon dioxide gas as bubbles. These bubbles expand under hot temperatures like in the oven while it is baking. This causes the baked bread or cake to become soft and spongy

(b)

Washing Soda is obtained by heating NaHCO₃ , which then decomposes to Na_2CO₃ (Sodium Carbonate) and H_2O and CO_2.

Chemical Reaction

$\mathbf{\fbox{2NaHCO_3 => Na_2CO_3 + H_2O + CO_2}}$

Then 10 molecules of H_2O is added to the product, which forms Na_2CO_3.10H_2O (Sodium Carbonate decahydrate). These molecules are known as the water of crystallization which changes the chemical properties of the substance.

$\mathbf{ Na_2CO_3 + 10H_2O => Na_2CO_3.10H_2O}$

Uses of washing soda:

• This compound is used in the laundries.
• This compound is used for the softening of water.

Answer 2

Answer:

Baking soda is a chemical compound which is also called as - Sodium bicarbonate (NaHCO₃).

1. Antacid - NaHCO₃ acts like an absorbable antacid. Baking soda imitates the action of natural sodium bicarbonate in the body and neutralizes the stomach acid relieving acid reflux.

2. Soda-acid fire extinguisher - A soda-acid fire extinguisher is usually a mixture of baking soda and an acid which is commonly sulfuric acid. It is used as a pressurized expeller to put off the fire. When it is expelled, a reaction in between the contents of the soda-acid occurs which releases carbon dioxide that extinguishes the fire.

3. Baking - When baking soda is mixed with moisture and with an acidic substance like yogurt, buttermilk etc, a chemical reaction occurs which produces carbon dioxide gas as bubbles. These bubbles expand under hot temperatures like in the oven while it is baking. This causes the baked bread or cake to become soft and spongy.