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Determination of K_sp Postlab

Please do not give short (one or two word answers) to the questions.

ALL Answers must be written by hand directly into your lab notebooks.

1. A solution is prepared by mixing 34.2 mL of 0.050 M Sc³⁺ with 60.1 mL of 0.050 M OH^–. After mixing, a precipitate of Sc(OH)₃ settles out and the resulting solution is found spectrophotometrically to be 0.01370 M in Sc³⁺_. Determine the K_sp of Sc(OH)₃.

1. AgCl is very insoluble in water (K_sp = 1.6 x 10⁻¹⁰) but when sodium cyanide (NaCN) is added, it dissolves readily. Propose a reasoning for this. Hint: Use the following equation to find your answer.

Ag+ (aq) + 2 CN– (aq) ↔ [Ag(CN)2]– (aq) Keq = 5.6 x 1018

Lab 6 Structure Determination Using Spectroscopy

Determine the structure of the compound based on the spectroscopic data below. Any valid conclusions drawn from the following spectra will be credited despite incorrect determination of the structure.

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