Science, asked by rupali1511, 11 months ago

(a) Why does an aqueous solution of an acid conduct
electricity ?
(b) How is the concentration of hydronium ions (H.07.
affected when a solution of an acid is diluted ?
(c) Which will have lowest pH among concertrate or
dilute hydrochloric acid ?
(d) What happen when dilute hydrochloric acid is added
in (i) Sodium carbonate in test tube (ii) Zinc Metal
in test tube.

Answers

Answered by Khansarah123
7

(a) The aqueous solution of an acid conduct electricity because the acid solution have ions and the movement of these ions in solution helps for flow of electricity current through the solution. And the ions are H+ ions.

(b) The concentration of hydronium ions decreases when an acid is diluted because on adding water the H+ ions of the acid and hydroxyl ions of water react to form water molecules and the concentration of hydronium ions decreases. When an acid is diluted, then the concentration of hydronium ions decreases.

(c) The ranges from 0 to 14,s with 0 being the most acidic and the acidity decreases and the substances gets more basic. 7 is neutral. -Concentrated Hydrochloric acid is more acidic hence will have a lower pH than dilute HCl. Therefore dilute HCl has a higher pH than concentrated HCl.

(d)

(i) Sodium carbonate in test tube

A clear liquid, and possibly some bubbles, should emerge as the HCl reacts with the sodium carbonate.

The formula for this reaction is:

2HCl(aq) + Na2CO3(s) -> 2NaCl(aq) + H2O(l) + CO2(g)

The hydrogen from the HCl and the CO3 from the sodium carbonate will form carbonic acid (H2CO3) which will decompose to water and CO2. The carbonic acid and the water should be the clear liquid and the CO2 should be the bubbles. The NaCl formed should dissolve in the water that formed with it.

(ii) Zinc Metal  in test tube.

Zinc reacts quickly with the acid to form bubbles of hydrogen. ♠When zinc granules are added to dilute hydrochloric acid, then zinc chloride is formed along the evolution of hydrogen gas .

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