Farmers apply slaked lime (calcium hydroxide) to their fields in order to neutralise soils that are too acidic for crops to grow well. Which ion in slaked lime is responsible for neutralising the acid in the soil?
- A$\text{Ca}^{2+}$
- B$\text{H}^+$
- C$\text{O}^{2-}$
- D$\text{OH}^-$