Question

What happens when:
a) Magnesium reacts with hydrochloric acid
b) Marble is treated with hydrochloric acid
c) Excess of carbon dioxide is passed through lime water.

Answer 1

Explanation:

1)The magnesium reacts with the acid, producing visible bubbles of hydrogen gas. (Optional) If the flame of a butane fireplace lighter is held above the bursting bubbles, they will produce audible pops as the hydrogen ignites. Magnesium ribbon is a flammable solid. Hydrochloric acid is a corrosive liquid.

2)Explanation: Calcium carbonate is dissolved by hydrochloric acid, thereby forming gaseous carbon dioxide: The combined reactants have a higher chemical potential than the combined products, i.e. the reaction takes place spontaneously. Answer: when marble is treated with hcl then bubbles of carbon dioxide released.

3)When CO2 is passed through lime water, it turns milky due to the formation of calcium carbonate which is sinsoluble in water. However, when excess of CO2 is passed through this solution, the milkiness disappears. This is due to the formation of calcium bicarbonate which is colorless and soluble in water.