sodium bicarbonate

noun

, Chemistry, Pharmacology.

1. a white, crystalline, water-soluble solid, in powder or granules, NaHCO 3 , usually prepared by the reaction of soda ash with carbon dioxide or obtained from the intermediate product of the Solvay process by purification: used chiefly in the manufacture of sodium salts, baking powder, and beverages, as a laboratory reagent, as a fire extinguisher, and in medicine as an antacid.

sodium bicarbonate

noun

1. a white crystalline soluble compound usually obtained by the Solvay process and used in effervescent drinks, baking powders, fire extinguishers, and in medicine as an antacid; sodium hydrogen carbonate. Formula: NaHCO 3 Also calledbicarbonate of sodabaking soda

sodium bicarbonate

1. A white crystalline compound used in beverages and as a leavening agent to make baked goods. In medicine, sodium bicarbonate is used as an antacid and cleanser and to replenish electrolytes. Also called baking soda, bicarbonate of soda. Chemical formula: NaHCO 3 .

Word History and Origins

Origin of sodium bicarbonate¹

First recorded in 1880–85

A Closer Look

A white, chalky powder, sodium bicarbonate also goes by its household name, baking soda. Sodium bicarbonate is a base and reacts with acids in what is called neutralization, because both the acid and the base are converted into more neutral substances on the pH scale. Neutralization with sodium bicarbonate usually produces carbon dioxide gas, which bubbles forth whenever vinegar (an acid) and baking soda are mixed (as they frequently are in “kitchen science” experiments). Such reactions are an important factor in baking, where the production of the gas is what causes cakes to rise. Sodium bicarbonate has long been used in small amounts (about a half teaspoon) mixed with water to neutralize excess stomach acid. Sodium bicarbonate also has the unique ability to neutralize substances that are more basic than it is. It can do this because in water, sodium bicarbonate breaks down ultimately into carbonic acid (H 2 CO 3 ), an unstable acid, which can then react with a base to neutralize it. This ability to neutralize both acids and many bases is why baking soda is so effective at reducing odors.

Example Sentences

It consists of a cylindrical container with a solution of sodium bicarbonate.

From Project Gutenberg

After the testing, the last sulphuric-acid absorber is coupled to the sodium-bicarbonate can.

From Project Gutenberg

Ten grains of calomel with five grains of sodium bicarbonate may be given for this purpose.

From Project Gutenberg

This consists in feeding them only with bread and milk, and giving sodium bicarbonate daily.

From Project Gutenberg

It is prepared by treating a solution of sodium carbonate and sodium bicarbonate with chlorinated lime.

From Project Gutenberg