Question

Studying the properties of acids and bases (Hcl and Naoh )on the basis of their reaction with: Litmus solution (blue and red), Zinc metal ,Solid sodium carbonate.
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Answer 1

Explanation:

The different properties of acids. Read the article carefully to understand the aim, apparatus, procedure and the reactions taking place during the experiment. You can conduct the experiment and try to match the result with this.

Aim:

To study the properties of acids (dilute HCl) and bases (dilute NaOH) by their reactions with the following:

Litmus solution (red/blue)

Zinc metal

Solid sodium carbonate

Materials required:

Test tube

Test tube stand

Cork

Test tube holder

Boiling tube

Droppers

Flat bottom flask

Burner

Match box

Beaker

Thistle funnel

Litmus paper/solution

Fresh lime water

Glass rod

Dilute HCl

Dilute NaOH

Zinc granules

Solid sodium carbonate

Theory:

What is acid?

Chemical species which donate proton or release H+ ions when dissolved in water are called acid. They turn blue litmus solution to red colour.

Hydrochloric acid reacts with zinc metal to produce zinc chloride and hydrogen gas. The reaction is given below:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Hydrochloric acid reacts with Na2CO3 to produce carbon dioxide and turns the lime water milky as it forms calcium carbonate. The milkiness formed is disappeared when more than necessary carbon dioxide is passed through the solution. The reaction is as follows:

Na2CO3(s/aq) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g)

Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)

CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)

Answer 2

Answer:

HCl and Na2CO3. Hydrochloric acid turns blue litmus solution/paper to red but it does not affect red litmus solution/paper. It reacts with zinc metal to liberate hydrogen gas and also forms zinc chloride as a product. It reacts with sodium carbonate to liberate carbon dioxide