GROUP 2 (alkaline earth metals) USES
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17 Terms
what is magnesium used for?
titanium extraction
titanium extraction equation
TiCl4 + 2Mg → Ti + 2MgCl2
why is titanium expensive?
magnesium is expensive
batch process makes it expensive as it’s slow so time and labour is needed
high temperatures are needed
why can’t titanium be extracted by electrolysis?
titanium extracted wouldn’t be pure
why can’t titanium be extracted with carbon?
titanium carbide (TiC) is formed rather than pure titanium
what is magnesium hydroxide - Mg(OH)2 - used for?
medicine - to neutralise excess acid in the stomach and to treat constipation
why is magnesium hydroxide - Mg(OH)2 - safe to use?
safe because it’s weakly alkaline
why is magnesium hydroxide - Mg(OH)2 - preferred to use than calcium carbonate?
carbon dioxide gas isn’t formed
what is calcium hydroxide - Ca(OH)2 - used for?
neutralising acidic soils in agriculture
is calcium hydroxide more alkaline than magnesium?
yes
why is calcium hydroxide more alkaline (at pH11)
more soluble so there’s more OH- ions present in solution
what is calcium hydroxide known as in solid form?
slaked lime
what is calcium hydroxide known as in aqueous form?
lime water
what is barium sulfate - BaSO4 - used for?
used as a barium meal as barium absorbs the X-ray
why can barium sulfate be used as a barium meal?
it’s insoluble so it’s not absorbed into the blood
what is calcium oxide/calcium carbonate - CaO/CaCO3 - used for?
removes SO2 from flue gases
where is sulfur dioxide produced and why does it need to be removed?
by-product of the combustion of fossil fuels.
to prevent formation of acid rain