110年 - 110 國立清華大學碩士班考試入學試題_分析與環境科學研究所:分析化學#104989

1. (5%) A new automated procedure for determining glucose in serum (Method A) is to be compared with the established method (Method B). Both methods are performed on serum from the sarne six patients to eliminate patient-to-patient variability. Do the following results confirm a difference in the two methods at the 95% confidence level?

2. (5%) The analysis of a calcite sample yielded CaO percentages of 55.95, 56.00, 56.04, 56.08, and 56.23. The last value appears anomalous; should it be retained or rejected at the 95% confidence level?
(To answer this question, please refer to the statistics table at the bottom of this page.)

(b) Suggest how the Equation list below could be employed to deternine the number of electrons involved in a reversible reaction at a voltammetric electrode.

15. (7%) (a) Describe the source of pH-dependence in a glass membrane electrode. (b) The cell 
 has a potential of 0.2094 V when the solution in the right-hand compartment is a buffer of pH 4.006. The following potential is obtained when the buffer is replaced with an unknown solution: -0.2910 V. Calculate the pH and the hydrogen ion activity of the unknown solution.

16. (5%) Following two figures are the absorption spectra of transition and rare earth ions. Apparently, these two spectra differ substantially from each other. Please state the reason why the absorption spectra of transition and rare earth ions are different.

18. (10%) How would you prepare 1.0 L of a buffer with a pH of 9.45 from 0.3 M Na₂CO₃ and 0.2 M HCI? (Na₂CO₃:)