Chemistry Questions and Answers October 17, 2019

A chemist combines 5.0 mL of 1 M KOH with 7.5 mL of 1.5 M HBr. She labels this solution as "solution A". She then adds a strip of magnesium metal to "solution A". Is "solution A" acidic, basic, or neutral? Will a reaction occur when the magnesium is added to "solution A"?

A chemist would like to monitor the progress of a chemical reaction using UV/V is spectroscopy. The spectrum for the starting material (solid line) and the product (dashed line) are given. At what wavelength should the chemist set the detector to monitor the course of the reaction? Explain your answer.

Absorbance 0.8 0.6 0.4 0.2 200 voll 300 400 500 600 Starting Material Product 700 800

A compound, C10H14, shows an IR peak at 825 cm-1. Its 1H NMR spectrum has peaks at delta 7.0 (4 H, broad singlet), 2.85 (1 H, septet, J=8 Hz), 2.28 (3 H, singlet), and 1.20 (6 H, doublet, J=8 Hz). Draw its structure.

A current of 1.00 A is applied to 1.0 L of 1.0 M HCl solution for 24 hours. This concentration allows the formation of hydrogen and chlorine gases as products. Find the pH of the final solution.