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Title: Write formulas and names for compounds composed of ions of following metals and the indicated polyatomic ions: Post by: rivs9 on Feb 14, 2013 Write formulas and names for compounds composed of ions of following metals and the indicated polyatomic ions:
A. magnesium and the hydroxide ion B. sodium and the dichromate ion Please explain. Thank you! Title: Write formulas and names for compounds composed of ions of following metals and the indicated polyatomic ions: Post by: irina on Feb 14, 2013 Content hidden
Title: Write formulas and names for compounds composed of ions of following metals and the indicated polyatomic ions: Post by: rivatayah on Feb 14, 2013 A. Magnesium hydroxide Mg(OH)2
B. Sodium Dichromate Na2CrO7 Names are sort of self-expalanatory. The reason I have used two hydroxide ions for every magnesium is that magnesium has a valency of 2, which means in this case it forms ions with 2 positive charges whereas hydroxide has a valency of 1 (one negative charge) To balance them and keep the salt electrically neutral we need a 1:2 ratio.formulae A similar thing applies to sodium dichromate. Sodium has a valency of 1 Na+)and dichromate has a valency of 2 (CrO7-) hence a 2:1 ratio here. |