大学分析化学A卷答案.pdfVIP

扬州大学试题纸 I Single choice 1. B 2. B 3. B 4. D 5. C 6. C 7. D 8. D 9. C 10. B 11. D 12. C 13. B 14. B 15. D . Fill in the blanks with the right answers + - 2-]+2[PO 3-] 1. 0.247 2. [H O ]+[H PO ]=[OH ]+[NH ]+[HPO 4 3 3 4 3 4 3. 7.0-9.0 4. direct titration, back-titration method, and displacement method 5. 1.06 V 6. larger, the slow oxidation of chloride ion that leads to the overconsumption of potassium permanganate 7. precipitate solubility, temperature, reactant concentration, rate at which the reactants are mixed; relative superstauration. 8. 2.88 9. decrease, smaller 10. anion Essay questions 1. In order to describe quantitatively the influence of the effective concentration of the participants in equilibrium at any given ionic strength on the equilibrium constant, 0 the thermodynamic equilibrium constant (K )was introduced. It is numerically constant and dependent on temperature only. The concentration equilibrium constant (K c) depends on the balance concentration of the participants and the temperature. With the change of the ionic strength, it changes too. The relationship between the concentration equilibrium constant is as follows: 0 c K =K  2. The anode of an electrochemical cell is the electrode at which oxidation occurs. The cathode is the electrode at which reduction occurs.  x  3. mean: x 1 0.7542 0.754 N 4. (a) stoichiometric ratio = 5 mmol/L Fe2+/1 mmol/L KMnO 4 Amount KMnO =