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Unformatted text preview: so pD=  log (2.98 x 108 M) = 7.526 if student used 2.983 x 108 M, then the answer would round to 7.525 partial points: if the set up is correct, but the # is a was incorrect and everything else was correct, give 3 points; 3 sig figs after the decimal place, so a total of 4 numbers in the answer (worth 1 point); If set up is correct, but a calculator error (+ 1 point) c) ( 3 points) What is the pK D of this liquid? pK D =  log K D = 15.051 partial points: 3 sig figs after the decimal place, so a total of 5 numbers in the answer (worth 1 point); If set up is correct, but a calculator error (+ 1 point) In lecture, students were informed that the number of decimal places in the log equals the number of significant figures in the pX function (see example 16.6 and appendix A)...
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 Winter '07
 Zellmer
 Chemistry, Equilibrium

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