A solid is insoluble in water but dissolves in aqueous acid and in aqueous alkali without evolution of a gas in either case.
What could the solid be?
(1) copper(II) carbonate
(2) copper(II) hydroxide
(3) sodium carbonate
(4) zinc carbonate
(5) zinc hydroxide
The answer is (5) zinc hydroxide..I don't understand..please explain..Thanks.
2007-11-06 14:17:17 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Zinc is amphoteric i.e. it can react with acids & bases
Zn(OH)2 + 2HCl = ZnCl2 + H2O
Zn(OH)2 + 2NaOH = Na2ZnO3 + H2O (sodium zincate)
(The carbonate would give off CO2 in acid)
2007-11-06 14:31:09 · answer #1 · answered by Aurium 6 · 0⤊ 0⤋
Probably an elimination process. All the carbonates will produce a gas, so that takes out 3 of 5 choices. I believe Cu(OH)2 is soluble, so that takes out #4.
2007-11-06 22:24:58 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
Carbonates are going to react with acids to give off carbon dioxide gas so that rules out all of the carbonate compounds on your list.
2007-11-06 22:23:08 · answer #3 · answered by chemmy 3 · 0⤊ 0⤋
The carbonates answer is correct.
Here's zinc hydroxide into alkali
Zn(OH)2 (s) + 2 OH- (aq) ---> Zn(OH)4 2- (aq)
2007-11-06 22:25:29 · answer #4 · answered by ChemTeam 7 · 0⤊ 0⤋