Calcium hydroxide is added to the soil as lime to increase the pH of acidic soils. Ca(OH)2 + 2H+ → Ca2+(aq) + 2H2O(l)Group 2 bases are also used as antacids to treat heartburn and indigestion. Magnesium and calcium carbonates are usually used. Milk of magnesia is suspension of magnesium hydroxide in water. The acid in the stomach is mainly hydrochloric acid.Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(l)and CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)Barium sulfate is insoluble. Patients are sometimes given a barium meal containing insoluble barium sulfate. This is so that soft tissue shows up more clearly on X-rays because they are coated with the dense white solid.
Uses of Group 2 Compounds
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Specification: OCR Chemistry A (H032), AS-level, 3.1.2 Group 2. Topic: Reactivity Trends.
Key terms in this lesson
- Acid
- A proton donor; a substance that releases hydrogen ions when dissolved in water.
- Base
- A proton acceptor.
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
More in Reactivity Trends
- Group 2 Redox Reactions with Dilute Acids
- Group 2 Reactivity and Ionisation Energy
- Reactions of Group 2 Oxides
- Solubility of Group 2 Hydroxides
- Group 7 Halogens Trends in Boiling Points
- Group 7 Redox Reactions and Reactivity
- Halogen-Halide Displacement Reactions
- Halogen Disproportionation Reactions
All 16 lessons in Reactivity Trends · All OCR AS-level Chemistry topics