Explain what is meant by the rate determining step of

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Explain what is meant by the rate determining step of a reaction mechanism. 1
Question 3: Experiment 10 Natural Waters If 25 drops of a water sample is titrated with 150 drops of 2.00 x 10 -4 M EDTA, what is the hardness of the water sample (in M and ppm CaCO 3 equivalents)? Explain why the hardness value determined by AA analysis of Ca 2+ and Mg 2+ would likely be less than the value determined by the EDTA titration. Question 4: Experiment 14 – Acid-Base Equilibria A weak acid (HA) is titrated 25% to completion with a solution of NaOH. The pH of the solution at this point of the titration is 3.7. What is the pK a of the weak acid? Estimate (do not calculate) the pH of the solution at the equivalence point for the above titration and explain your estimation. For a titration involving HNO 3 and KOH, explain how you would select an appropriate pH indicator. 2
Question 5: Experiment 15 – Redox and Electrochemistry Draw and label a diagram for a typical voltaic cell containing Cu and Al electrodes and 1.0 M aqueous solutions of Cu 2+ and Al 3+ at 25.0 o C. Write out the half reactions and overall reaction for this cell. What is E cell for this reaction? How do the concentrations of Cu 2+ and Al 3+ change during this reaction? Question 6: Experiment 9 – Halogens What are the half-reactions and overall reactions during the electrolysis of an aqueous KCl solution? What reaction is happening at the cathode and the anode? Thinking back to the similar experiment that was done in the lab, what visual clues could you use to determine that the reaction is occurring? o 3
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