Pre lab for ex 12

Pre lab for ex 12 - K c = 43.9 2. ×-× . = . 2 10 3L 0 1M...

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1. Ferricyanide is the name for the [Fe(CN) 6 ] 3− . Its systematic name is hexacyanoferrate(III) ion. The oxidation state of Fe in this ion is 3 (positive). A strong acid is an acid that dissociates completely in an aqueous solution (not in the case of sulfuric acid as it is diprotic), or in other terms, with a p K a < −1.74. A weak acid is an acid that dissociates incompletely and does not release all of its hydrogen in a solution i.e. it does not completely donate all of its protons. These acids have higher pKa compared to strong acids, which release all of their hydrogen when dissolved in water.When dissolved in water, acid absorb ions while the base release ions. Thus, + Fe3 is considered as acid and the - CN is the base. Fe3+(aq) + 6CN–(aq) [Fe(CN)6]3–(aq) log10
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Unformatted text preview: K c = 43.9 2. ×-× . = . 2 10 3L 0 1M 0 0002mol × . = . V 3 0M 0 0002mol = . = = V 0 00023 230000L 230ml = ÷ . / = . ≈ n 230ml 0 04ml drop 1 66 2drop 3. In this reaction, ( ) Al OH 3 is considered as precipitate. ++-= ( ) Al 3OH Al OH 3 The complex ion in this case is ( ) NaAl OH 4 ( ) +-= ( ) -Al OH 3 OH Al OH 4 The precipitate in this case is ( ) Al OH 3 ( ) -+ += ( ) + Al OH 4 2H Al OH 3 H2O When add one drop of NaOH into the solution ( ) Al2 SO4 3 , we can see the precipitate in the solution dissolved and the solution turns to be clear. If ass one drop of H2SO4 into ( ) NaAl OH 4 , the clear solution disappeared and create precipitate....
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This note was uploaded on 11/10/2009 for the course CHEM 120 taught by Professor Dr.wagner during the Spring '07 term at Pittsburgh.

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