Chp4_QandK

# Chp4_QandK - Consider the reaction at 298K NH 4 1 aq CN 1...

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Consider the reaction at 298K: ( 29 ( 29 ( 29 ( 29 aq HCN aq NH aq CN aq NH + + - + 3 1 1 4 For which K = 1.41 (as we will discover in chapter 7). Now, suppose, that we are told that we make a mixture of the following (initial) concentrations: [NH 4 1+ ] = 0.65M [CN 1- ] = 0.12M [NH 3 ] = 0.31 M and now consider the following Excel Table for various (initial) concentrations of [HCN]: K= 1.41 DG^0= -0.85127 [NH4+]= 0.65 [CN-]= 0.12 [NH3]= 0.31 Q Q/K DG [HCN]= 1 3.974359 2.818694 2.567443 0.8 3.179487 2.254955 2.014589 0.6 2.384615 1.691217 1.301836 0.4 1.589744 1.127478 0.297267 0.2 0.794872 0.563739 -1.42006 0.1 0.397436 0.281869 -3.13738 0.08 0.317949 0.225496 -3.69023 0.06 0.238462 0.169122 -4.40298 0.04 0.158974 0.112748 -5.40755 0.02 0.079487 0.056374 -7.12488 0.01 0.039744 0.028187 -8.8422 Firstly, convince yourself that you can obtain these values. Secondly, note that K > 1 implying that equilibrium favors the “stuff on the right” though not dramatically so. Thirdly, note that DG changes sign between [HCN] = 0.4 and 0.2M.

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Chp4_QandK - Consider the reaction at 298K NH 4 1 aq CN 1...

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