HydrolysisExample

HydrolysisExample - Chem 116 Fall 2006 Prof Sevian Which of...

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Chem 116 Fall 2006 Prof. Sevian Hydrolysis example problem similar to a text book exercise, Ex. 16.17, p. 701. From lecture notes 11-9-06. Which of the following salts, when added to water, would produce the most acidic solution? a) KBr b) NH 4 NO 3 c) AlCl 3 d) Na 2 HPO 4 (Assume the comparison is of equal molar quantities of each one added to water.) Here is a comparison of what happens chemically and mathematically when each of these salts is added to water. Remember, a “salt” in the Bronsted-Lowry scheme is a conjugate of either an acid or a base, and sometimes both. KBr NH 4 NO 3 AlCl 3 Na 2 HPO 4 When KBr is added to water, it dissociates into K + and Br KBr ( s ) K + ( aq ) + Br ( aq ) Does K + have a conjugate acid or base? No. It cannot accept an H + and it cannot donate an H + . Does Br have a conjugate acid or base? Yes, it can accept an H + , so Br is a base and HBr is its conjugate acid. What reaction could happen when Br reacts with water? Br + H 2 O ' HBr + OH But this reaction does not occur to any reasonable extent because HBr is a strong acid, so the equilibrium in the reaction lies very strongly to the left. Since no new H + or OH are produced, the resulting KBr (aq) solution remains as neutral as the original water solvent. pH = 7
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This note was uploaded on 12/02/2011 for the course PHYSICS 235 taught by Professor Staff during the Fall '08 term at Rutgers.

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HydrolysisExample - Chem 116 Fall 2006 Prof Sevian Which of...

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