Question

can anyone answer all thses questions please​

Answer 1

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1. HCl has higher concentration of H+ ions as it is a strong acid.

2. CH3COOH is considered as a weak acid and HCl is considered as a strong acid because HCl goes under total replacement of H+ ions.

3. When dil. HCl reacts with metal carbonates, carbon dioxide (CO2) gas is evolved.

4. An increase in concentration of H+ ions, it's acidity nature increases and it shows pH <7.

5. When dil. HCl reacts with active metal, Hydrogen gas is evolved.

6. Tooth decay starts when the pH of mouth is lower than 5.5 because the Saliva produced by the salivary glands is alkaline and it helps to increase the pH to some extent.

7. When a solution of an acid is diluted, the concentration of H+ ions decreases which results in the increase of pH.

9. 6,4,2,0

10. The flow of acid rain makes the survival of aquatic life difficult in rivers as the acid content in the water increases which makes difficult for them to respire.

11.a)i) Before heating, the colour of CuSO4 is blue.

ii) After heating, the blue colour fades away.

12)i. The products formed are sodium carbonate, water and carbon dioxide.

ii) NaHCO3 —› NaCO3 + CO2 + H2O

13. Bleaching powder or calcium oxychloride (CaOCl2) is used to disinfect the drinking water.

15.i) When CO2 is passed through lime water in a limited quantity it form slaked lime.

ii) When CO2 is passed through lime water in excess it forms a white curdy precipitate.