Answered: (1a) Pure benzophenane freezes at 66.6…

General, Organic, and Biological Chemistry

7th Edition

ISBN:9781285853918

Author:H. Stephen Stoker

Publisher:H. Stephen Stoker

Chapter8: Solutions

Section: Chapter Questions

Problem 8.6EP: For each of the following pairs of solutions, select the solution for which solute solubility is...

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(1a) Pure benzophenane freezes at 66.6 °C. A solution of 7.75 g of biphenyl (C12H10; molar mass = 154.2g/mol) plus 200.08 g of benzophenane froze at 59.9 °C. Calculate the Kf of benzophenane in °C*kg/mol.

(b)

An unknown solution with possible cations (Ag⁺, Hg₂²⁺, Pb²⁺) is treated with 6M HCl and a white precipitate forms. Hot water is added to the precipitate, and a white solid remains after filtration. The white solid is treated with aqueous NH₃, and the precipitate turns grey or black. The resulting solution is treated with HNO₃ and no precipitate forms. What cations can you determine to be present, absent or maybe present? Explain your reason

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