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Unformatted text preview: Place 20 drops of the unknown solution into a test tube. Add sodium hydroxide solution dropwise, and observe the result. In each case a precipitate will form in the test tube. By recognizing the physical properties (color, maturity, ) of the precipitate you will be able to identify the unknown Ion. Observations: Ca 2+ (aq) Forms white precipitate. Ca 2+ (aq) + 2OH-(aq) Ca(OH) 2(s) Al 3+ (aq) Forms white precipitate. Al 3+ (aq) + 3OH-(aq) Al(OH) 3(s) This precipitate will dissolve upon addition of excess NaOH (aq) to it. Cu 2+ (aq) Forms blue gelatinous precipitate. Cu 2+ (aq) + 2OH-(aq) Cu(OH) 2(s) Fe 2+ (aq) Forms dark green gelatinous precipitate. Fe 2+ (aq) + 2OH-(aq) Fe(OH) 2(s) Fe 3+ (aq) Forms red/brown (rust) gelatinous precipitate. Fe 3+ (aq) + 3OH-(aq) Fe(OH) 3(s)...
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This note was uploaded on 04/29/2008 for the course SCI 001 taught by Professor Worm during the Spring '08 term at Central Pennsylvania.
- Spring '08