Analysis Version: One Question per Day 12.13

Thread Content

1. Please hide your replies; editing after posting is invalid! Delete directly without hiding! 2. Hiding method: http://bbs.hcbbs.com/thread-492556-1-1.html 3. There is a reward for participation; those who answer correctly receive 5 wealth points. Title: When determining the concentration of Cl— in a solution using potentiometric titration, which of the following can be used as a reference electrode? A. Calomel electrode B. Glass electrode C. Composite calomel electrode D. Silver electrode. Answer to the previous question: When two strong electrolyte solutions with pH values of 1 and 3 are mixed in equal volumes, ignoring the effect of ionic strength, the pH value of the resulting solution is (C) A. 2.3 B. 0.5 C. 1.3 D. 1.5 E. 2.0. Explanation: After mixing these two solutions in equal volumes, the hydrogen ion concentration in the solution is (0.1 + 0.001)/2 = 0.0505 mol/L, and thus the pH value is 1.3.