Question

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A student adds an equal volume of aqueous sodium carbonate separately to dilute ethanoic acid and dilute hydrochloric acid.

i) What does the student observe in both reactions ?


ii) Compare the rate of the two reactions and explain the difference.

Answer 1

Do you like a little vinegar on your chips? The sharp taste comes from the ethanoic acid in the vinegar. You might not enjoy your food as much with hydrochloric acid of a similar concentration sprinkled on it! That's because ethanoic acid is a weak acid and hydrochloric acid is a strong acid. In this unit we will learn why these acids differ.

Strong acids

Hydrogen chloride (HCl) is a gas. It shows its acidic properties when it dissolves in water: 

HCl(g)  +  H2O(l)    H3O+(aq)  +  Cl−(aq)

Notice that we use an equilibrium sign in the equation when hydrogen chloride is added to water. This is because the reaction is reversible. However, because hydrochloric 

acid is a strong acid, the position of equilibrium lies well over to the right-hand side of the equation. In other words, almost all the molecules of HCl dissociate (split up) in water to form ions.

Answer 2

HIIII

ANSWERS :-------


1.) WHEN HYDROCHLORIC ACID IS ADDED TO SODIUM CARBONATE BRISK Effervescence OF CO2 OCCURS ,ALONG WITH THE FORMATION OF SODIUM CHLORIDE AND WATER.

EQUATION:-----

Na2CO3 + 2HCL = 2NaCL +CO2 + H20