Before balancing the chemical reaction, let’s first write the chemical formula of each of the compounds involved in the reaction.
• Aluminum is in its elemental state as a metal → Al(s)
• It has 0 oxidation state
• Sulfuric acid is an oxyacid
• It is made up of H+ and the sulfate ion SO42-
• When ions combine, their charges or oxidation numbers crisscross to become subscripts
• H+ will have a subscript of 2 fromSO42- → H2
• SO42- will have a subscript of 1 from H+ → SO4
• Subscript 1 is no longer indicated → H2SO4(aq)
Recall: SO4- are soluble except when paired with Ca2+, Sr2+, Ba2+, Ag+, Pb2+
Write a balanced chemical equation for the following and classify the reaction.
Aluminum metal and sulfuric acid yield aqueous aluminum sulfate and hydrogen gas.
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