QUESTION 10 An impure aqueous sample of I was extracted with ether. The ether layer was then extracted with 0.1 M HCI. Which layer will contain the compound after the second extraction? NHz A. both, because I is soluble in both, 0.1 M HCI and ether. B. ether layer O C. none, because I doesn't dissolve in ether in the first extraction. D. aqueous layer (0.1 M HCI)

Titration of another 30.0 mL sample of aqueous HX with 0.111M NaOH yields the titration curve below. A. Based on the titration curve and data provided, what is the molar concentration of HX? Does this agree with your earlier determination? B. What components in your flask account for the shape of the curve between 1 mL and 25 mL? Explain the shape in this region. C. The above titration curve is concave down from 0 mL to about 14 mL. Which of the components you listed in B is highest in concentration over this range? Consider how pH changes as you move backward from 14 mL back to 0 mL added base. How is this change consistent with the species you identified having a high concentration over this range? D. The above titration curve is concave up from 14 mL until the dramatic spike occurs. Which of the components you listed in B is highest in concentration over this range? How is the pH change from 14 mL to the upward spike consistent with this species having a high concentration over this…

The pH at the half equivalence point volume (~15.3 mL) on the titration curve from this experiment is approximately 4.8. Based on this estimate, what value do you expect for the K₂ of CH3COOH? (Make sure you use the correct s.f. rule for logs where the number of decimals in the pH become the number of s.f. in the value.)

Write the name or formula for a reagent that will dissolve PbC12 but not Hg2Cl2 and AgCl.