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1. Why does an aqueous solution of acid conduct electricity?2. How does the concentration of hydrogen ions [H3O+] change when the solution of an acid is diluted with water?3. Which has higher pH? A concentrated or dilute solution of HCl?4. What would you observe on adding dil HCl acid to(a) Sodium bicarbonate placed in a test tube?(b) Zinc metal in a test tube. |
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Answer» 1. The aqueous solution of acid conduct electricity because the acid solution have H+ ions and the movement of these ions helps for the flow of electrical current through the solution. Hence, the aqueous solution of an acid conduct electricity. 2. During dilution, more of acid dissociates into ions. Thus, concentration of [H3O+] ions will increase on dilution. 3. Even on increasing [H3O+] ions, the number of ions per unit volume decreases. 4. (a) CO2 gas will evolve accompanied by brisk effervescence. (b) H2 gas will evolve accompanied by brisk effervescence. Zn(s) + 2HCl (aq) → ZnCl (aq) + H2O(q) |
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