Chapter 18 Lecture 5

Chapter 18 Lecture 5 - The acidic behavior of the hydrated...

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The acidic behavior of the hydrated metal ions Al(NO 3 ) 3 ( s ) + 6H 2 O ( l ) Al(H 2 O) 6 3+ ( aq ) + 3NO 3 - ( aq ) Electron density drawn toward Al 3+ Nearby H 2 O acts as base H 3 O + H 2 O + Al(H 2 O) 5 OH 2+ Al(H 2 O) 6 3+ 18-52 A small, highly charged central metal ion behaves like a central electronegative atom in an oxoacid
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Table 18.7 K a Values of Some Hydrated Metal Ions at 25 o C Free Ion Hydrated Ion K a Fe 3+ Fe(H 2 O) 6 3+ ( aq ) 6 x 10 -3 Sn 2+ Sn(H 2 O) 6 2+ ( aq ) 4 x 10 -4 Cr 3+ Cr(H 2 O) 6 3+ ( aq ) 1 x 10 -4 Al 3+ Al(H 2 O) 6 3+ ( aq ) 1 x 10 -5 GTH Cu 2+ Cu(H 2 O) 6 2+ ( aq ) 3 x 10 -8 Pb 2+ Pb(H 2 O) 6 2+ ( aq ) 3 x 10 -8 STREN G Zn 2+ Zn(H 2 O) 6 2+ ( aq ) 1 x 10 -9 Co 2+ Co(H O) 2+ ( aq ) 2 x 10 -10 ACID S 2 6 Ni 2+ Ni(H 2 O) 6 2+ ( aq ) 1 x 10 -10 18-53
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Acid-base properties of salt solutions A salt consisting of the anion of a strong acid and the cation of a strong base yields a neutral solution – because the ions do not react with water salt consisting of the nion of a strong acid nd the ation f a NaCl ( s ) Na + ( aq ) + Cl - ( aq ) A salt consisting of the anion of a strong acid and the cation of a weak base yields an acidic solution – because the cation acts as a weak acid NH 4 Cl( s ) NH 4 + ( aq ) + Cl - ( aq ) dissolution and hydration NH 4 + ( aq ) +H 2 O ( l ) NH 3 ( aq ) + H 3 O + ( aq ) dissociation of weak acid A salt consisting of the anion of a weak acid and the cation of a strong base yields a basic solution because the anion acts as a weak base
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Chapter 18 Lecture 5 - The acidic behavior of the hydrated...

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