even answers 10.05-10.26.09

Even answers - Even-numbered answers for recitations Oct 5 Oct 26(4.12 When CH3OH dissolves neutral CH3OH molecules are dispersed throughout the

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26 (4.12) When CH 3 OH dissolves, neutral CH 3 OH molecules are dispersed throughout the solution. These electrically neutral particles do not carry charge and the solution is non-conducting. When CH 3 COOH dissolves, most neutral molecules are dispersed throughout the solution. A few of the dissolved molecules ionize to form H + ( aq) and CH 3 COO - ( aq) . These few ions carry some charge and the solution is weakly conduct. (4.22) Precipitate in bold . (a) Ni(NO 3 ) 2 ( aq ) + 2 NaOH( aq ) Ni(OH) 2 ( s ) + 2 NaNO 3 ( aq ) (b) No precipitate, no reaction (c) Na 2 S( aq ) + Cu(CH 3 COO) 2 ( aq ) CuS( s ) + 2 NaCH 3 COO( aq ) (4.24) (a) 2 Cr 3+ ( aq ) + 3 CO 3 2– ( aq ) Cr 2 (CO 3 ) 3 ( s ) Spectator ions: SO 4 2– and NH 4 + (b) Ba 2+ ( aq ) + SO 4 2– ( aq ) BaSO 4 ( s ) Spectator ions: NO 3 and K + (c) Fe 2+ ( aq ) + 2 OH ( aq ) Fe(OH) 2 ( s ) Spectator ions: NO 3 and K + (4.34) All soluble ionic hydroxides from Table 4.1 are listed as strong bases in Table 4.2. Insoluble hydroxides like Cd(OH) 2 are not listed as strong bases. “Insoluble” means less that 1% of the base molecules exist as separated ions and are dissolved. Thus, insoluble hydroxide salts produce too few OH - (aq) to be considered strong bases. (4.40) (a) Molecular: HC 2 H 3 O 2 ( aq ) + KOH( aq ) KC 2 H 3 O 2 ( aq ) + H 2 O( l ) Net ionic: HC 2 H 3 O 2 ( aq ) + OH ( aq ) C 2 H 3 O 2 ( aq ) + H 2 O( l ) (b) Molecular: Cr(OH) 3 ( s ) + 3 HNO 3 ( aq ) Cr(NO 3 ) 3 ( aq ) + 3 H 2 O( l ) Net ionic: Cr(OH) 3 ( s ) + 3 H + ( aq ) Cr 3+ ( aq ) + 3 H 2 O( l ) (c) Molecular: 2 HClO( aq ) + Ca(OH) 2 ( aq ) Ca(ClO) 2 ( aq ) + 2 H 2 O( l ) Net ionic: HClO(
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This note was uploaded on 02/09/2010 for the course CHE CHE 106 taught by Professor Korter during the Fall '09 term at Syracuse.

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Even answers - Even-numbered answers for recitations Oct 5 Oct 26(4.12 When CH3OH dissolves neutral CH3OH molecules are dispersed throughout the

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