Page 6 - Microsoft Word - Module-2

(d)Sodium Hydrogen carbonate (baking soda), NaHCO
3

It is called baking soda because on heating it

generates bubbles of CO (leaving holes in cakes or
2
pastries and making them light and fluffy).

Preparation: It can be obtained by saturated solution

of Na CO with CO .
3
2
2
Na CO + CO + H O 2NaHCO
3
2
3
2
2
Properties: It is white crystalline solid and less
soluble in water.
Uses:

 It is used in fire extinguisher.

 It is used as antiseptic and antacid.

BIOLOGICAL IMPORTANCE OF Na AND K

 Sodium ions participate in the transmission of nerve

signals, in regulating the flow of water across the cell

membranes and in transport of sugars and amino

acids to cells.

 Potassium ions are more within cell fluids, where

they activate many enzymes, participate in oxidation

of glucose to ATP.