Which of the following could best be prepared by a reaction involving an acid?
(1) iron(II) carbonate
(2) lead(II) carbonate
(3) magnesium sulphate
(4) silver chloride
The answer is (3) magnesium chloride...why? Please explain cos I really need to understand..Thanks.
2007-11-08 12:14:12 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
To form the iron and lead compounds would presumably involve reaction of the metal with the proper acid to make a carbonate, but carbonic acid (H2CO3) is a very wimpy acid and would not react with the metals indicated in any reasonable time.
For formation of silver chloride; silver doesn't react with HCl (although you could react it with HNO3 to make AgNO3 and then add sodium chloride to convert it to AgCl) so, technically, this would involve an acid. You might be able to argue this point with your teacher if you would like to become the class trouble maker.
Magnesium reacts readily with most acids to form the corresponding magnesium salts.
2007-11-08 12:32:47 · answer #1 · answered by Flying Dragon 7 · 0⤊ 0⤋
A carbonate would start with H2CO3. Iron and lead aren't more reactive than hydrogen so the reaction wouldn't work. A chloride would start with HCl, but silver isn't more reactive than hydrogen. Magnesium is more reactive than hydrogen, so Mg + H2SO4 -> H2 + MgSO4.
2007-11-08 12:22:34 · answer #2 · answered by John D 3 · 0⤊ 0⤋
Mg + H2SO4 ===> MgSO4 + H2
Unless you truly want magnesium chloride, in which case the answer is:
Mg + 2HCl ===> MgCl2+ H2
2007-11-08 12:19:27 · answer #3 · answered by steve_geo1 7 · 0⤊ 0⤋
Carbonic acid is too weak to react with lead or iron.
Silver is too inert to react with hydrochloric acid.
magnesium is a reactive metal and will react easily with sulphuric acid.
2007-11-08 12:26:04 · answer #4 · answered by Aurium 6 · 0⤊ 0⤋
because it's sexy!
2007-11-08 12:17:18 · answer #5 · answered by Kimberley Rose 2 · 0⤊ 0⤋