Question

[Q.15] Explain strong acid and weak
acid .

[Q.16] Explain the preparation of washing soda and ots four uses .

Q.17 Answer the following questions:

(1 ). How is the strength of acid and base decided .

(2) . Explain the importance of pH stopping decay of teeth. ​

Answer 1

Answer:

15.A weak acid is an acid that partially dissociates into its ions in an aqueous solution or water. In contrast, a strong acid fully dissociates into its ions in water. The conjugate base of a weak acid is a weak base, while the conjugate acid of a weak base is a weak acid.

16.Washing soda is sodium carbonate containing 10 molecules of water of crystallisation.It is called as sodium carbonate decahydrate. It is prepared by Solvay's process. 1)A cold and concentrated solution of sodium chloride is reacted with ammonia and carbon dioxide to obtain sodium hydrogen carbonate.Jul 21, 2016

17.The extent to which an acid, HA, donates protons to water molecules depends on the strength of the conjugate base, A−, of the acid. ... If A− is a weak base, water binds the protons more strongly, and the solution contains primarily A− and H3O+—the acid is strong.

18.Regulating the pH in the mouth will also help reduce the bacteria in our mouths, thereby reducing our risk for cavities, gum disease, and tooth decay. Bacteria feed off sugars that are commonly found in sucrose (table sugar), glucose, fructose, lactose, and cooked starches.

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Answer 2

Answer:

those are which contains hydrogen and completely dissociate into ions in their aqueous form are known as as strong acids.

Whereas, those acids which contain hydrogen but they partially dissociate into ions in their aqueous form are known as weak acids.

washing soda is prepared by a process known as solvay process orAmmonia - soda process. In this process, carbon dioxide is passed in the ammonical brine which leads to the formation of ammonium chloride and sodium bicarbonate.

NaCl + H20 + NH3 + Co2 ---------> NaHCO3 + NH4Cl

now, sodium bicarbonate is heated to form sodium carbonate and water molecules.Then you add water to sodium carbonate which forms sodium carbonate decahydrate which is washing soda.

NaHCO3 ---------> NaCO3 + H20

(heat)

NaCO3 + H2O -------> Na2CO3.10H2O