Group 2 - Sulfates & Hydroxides
No description yet. This curated deck is ready for daily study.
Card preview (14)
How do the solubilities of hydroxides change down Group 2?
The solubility of hydroxides increase down the group
What is the physical appearance of group 2 hydroxides?
They are all white solids
Describe Mg(OH)₂ solubility
Sparingly soluble
Why is Mg(OH)₂ used in medicine
To neutralise excess stomach acid, as an antacid
Why is Ca(OH)₂ used in agriculture?
Neutralises acidic soil
What is the solubility trend for barium hydroxide (Ba(OH)2)?
Barium hydroxide is highly soluble in water
Which substances remove SO₂ from flue gases, and why does it need to removed?
SO₂ is removed to prevent acid rain, CaO (quicklime) or CaCO₃ (limestone) is used to remove sulfur dioxide from flue gases
Outline the reactions involving quicklime and limestone removing sulfur dioxide from flue gases
Quicklime: CaO + SO₂ → CaSO₃ Limestone: CaCO₃ + SO₂ → CaSO₃ + CO₂
How does the solubilities of sulfates change down Group 2?
The solubilities of sulfates decreases down the group
Which group 2 sulfate is virtually insoluble?
Barium sulfate
Why is barium sulfate (BaSO4) used in medicine?
Barium sulfate is almost insoluble, making it safe to swallow and dense enough to absorb X - rays
How do you test for sulfate ions and what is the positive test? (+acdfd. BaCl2 sol. frms. whte. ppt. BaSO4)
By adding acidified BaCl₂ solution which forms white precipitate of BaSO₄
Why is BaCl₂ used?
Ba²⁺ ions form insoluble BaSO₄ with sulfate ions.
Why is the solution acidified? (rmvs. crbnte. ions. wld. frm. whte. ppt)
Removes carbonate ions that would also form white precipitate