Question 2.11: Determining Names and Formulas of Ionic Compounds Containing......

Chemistry The Molecular Nature of Matter and Change With Advanced [1125936]

Determining Names and Formulas of Ionic Compounds Containing Polyatomic Ions (Including Hydrates)

Problem Give the systematic name for the formula or the formula for the name:

(a) $Fe(ClO_4)_2$ (b) Sodium sulfite (c) $Ba(OH)_2\cdot8H_2O$

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Solution (a) $ClO_4^-$ is perchlorate, which has a 1− charge, so the cation must be Fe $^{2+}$ . The name is iron(II) perchlorate. (The common name is ferrous perchlorate.)
(b) Sodium is Na $^+$ ; sulfite is $SO_3^{2−}$ , and two Na $^+$ ions balance one $SO_3^{2−}$ ion. The formula is $Na_2SO_3$ .
(c) Ba $^{2+}$ is barium; OH $^-$ is hydroxide. There are eight (octa-) water molecules in each formula unit. The name is barium hydroxide octahydrate.

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