a) Acid (vinegar) + universal indicator + sodium bicarbonate
Observation: Bubbling occurs, the solution may turn green (neutral), and the mixture may feel warmer.
b) Acid (vinegar) + universal indicator + magnesium ribbon
Observation: Vigorous bubbling (hydrogen gas released), the solution may turn green, and the magnesium ribbon dissolves.
c) Acid (vinegar) + universal indicator + calcium carbonate (e.g., chalk or marble chips)
Observation: Bubbling (carbon dioxide gas released), the solid may dissolve slowly, and the solution may turn green.
In a neutralisation reaction, hydrogen ions (H⁺) from the acid react with hydroxide ions (OH⁻) from the base to form water (H₂O). The remaining ions combine to form a salt. This process reduces the concentration of H⁺ and OH⁻ ions, resulting in a neutral solution (pH 7).
2. Complete the word equation:
Ethanoic acid + sodium bicarbonate → sodium ethanoate + carbon dioxide + water
Parent Tip: Review the logic above to help your child master the concept of neutralization reactions worksheet answers.
