1.1. A student determines the amount of magnesium carbonate in an indigestion tablet.

The tablet reacts with excess dilute hydrochloric acid according to the equation:

MgCO₃ (s) + 2HCl (aq) → MgCl₂ (aq) + CO₂ (g) + H₂O (l)

The student records the following measurements:

• Mass of tablet = 1.25 g ± 0.01 g

• Volume of hydrochloric acid used = 25.0 cm³ ± 0.05 cm³

• Concentration of hydrochloric acid = 1.00 mol dm^-3

Calculate the percentage uncertainty in the mass of the tablet.

1.2. Calculate the percentage uncertainty in the volume of hydrochloric acid used.

1.3. State which measurement contributes the greatest percentage uncertainty to the final result. Justify your answer.

1.4. Suggest one improvement to the experiment that would reduce the percentage uncertainty in the final result. Justify your answer.