Investigating the Effect of Boiling Temperature on the Mass of Calcium Leached from Brassica oleracea (Kale) via Gravimetric Analysis

This investigation explores how increasing boiling temperatures (60.0–100.0 °C) affect the mass of calcium leached from Brassica oleracea (kale). The study employs gravimetric analysis, using anhydrous sodium carbonate to precipitate calcium carbonate for quantification.

Results demonstrate a strong positive correlation (R² = 0.9858) between temperature and calcium leaching, with mean mass increasing from 18.01 mg to 41.81 mg. The analysis integrates Fick's Law and solubility product constants (Ksp) to explain the leaching mechanisms.

This exemplar is distinguished by its rigorous uncertainty propagation, detailed systematic and random error analysis, and a nuanced discussion on the transition between calcium pectate and calcium oxalate dissolution.