Predict the chemical formulas of the compound formed by the following pairs of ions:
1) Cu+ and S 2- = Cu2S
2) Fe 3+ and O 2- = Fe2O3
3) Hg2 2+ and CO3 2- = Hg2CO3
4) Ca 2+ and AsO4 3- = Ca2O4 + As3
5) NH4 + and CO3 2- = (NH4)2CO3
2007-10-22 08:26:50 · 5 answers · asked by Whitney D 1 in Science & Mathematics ➔ Chemistry
All of them are right except number 4. Its not a single replacement reaction. AsO43- is a polyatomic ion called arsenate. The correct answer would be Ca3(AsO4)2
2007-10-22 08:34:37 · answer #1 · answered by Apium 2 · 0⤊ 0⤋
All correct except No. 3 & 4
No. 3 . I think your 'Hg2 2+' is incorrect. If it is Hg2+ then with CO32- it becomes HgCO3. However there is also a Hg2CO3 compound and the formula is:-
2Hg+ + CO32- = Hg2CO3
No. 4. Ca2+ + AsO43- = Ca3(AsO4)2 - Calcium Arsenate.
2007-10-22 08:44:45 · answer #2 · answered by lenpol7 7 · 0⤊ 0⤋
Mostly...
1) Correct
2) Correct
3) Correct
4) Should be Ca3(AsO4)2
5) Correct
Not too sure why you did number 4 the way you did, but good luck to you!
2007-10-22 08:35:30 · answer #3 · answered by Anonymous · 0⤊ 0⤋
#1,2,3,5 are correct.
#4 is not a Single Replacement reaction. The compound formula would be
Ca3(AsO4)2
2007-10-22 08:35:55 · answer #4 · answered by Gene C 2 · 0⤊ 0⤋
1), 2), 3), 5) are correct - good job
but arsenate ion doesn't fall apart like you have it:
4) 3Ca+2(aq) + 2AsO4-3(aq) --> Ca3(AsO4)2(s)
ref: http://en.wikipedia.org/wiki/Calcium_arsenate
2007-10-22 08:37:11 · answer #5 · answered by Dr Dave P 7 · 0⤊ 0⤋