Unformatted text preview: pretty easy to do if we know the charges on each ionic participant. The Roman numeral after chromium tells us that chromium, when separated from cyanide, would have a +3 charge. You should have memorized that cyanide ion (CN-) has a -1 charge. Ionic compounds are neutral, so we need to add enough chromium ions and cyanide ions to make a neutral compound. This would occur with one chromium cation and three cyanide anions like this Cr +3 + 3CN-1 → Cr(CN) 3 Oftentimes the charge on one ion will become the subscript on the other ion when written as an ionic compound. Now let’s do the dimensional analysis: 13g Cr(CN) 3 │ 1mol Cr(CN) 3 │ 3mol CN-= 0.3g CN-│ 130g Cr(CN) 3 │ 1 mol Cr(CN) 3...
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This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.
- Fall '08