Author: Anonymous

Element X has two natural isotopes:  X-63 (62.930 amu) and X-65 (64.928 amu).  Calculate the atomic mass of the element X given the abundance of X-63 is 69.09%.

Which one of the following is the best representation of the titration curve that will be obtained in the titration of a weak acid (0.10 mol L–1) with a strong base of the same concentration?  

Which one of the following is the best representation of the titration curve that will be obtained in the titration of a weak acid (0.10 mol L–1) with a strong base of the same concentration?  

In preparing for succession, the senior generation has certain responsibilities. One of these is that the

Trihydroxybenzoic acid (THB) is a not-so-weak acid with an ionization constant:  Ka = 2.1 × 10-2.  Calculate the [H+] and the pH of a 0.050 molar solution of THB

A 0.200 M solution of an acid, HA, has a pH = 3.50.  What is the value of the ionization constant Ka for this acid?

Select the pair of substances in that an acid is listed followed by its conjugate base.  

A 0.200 M solution of an acid, HA, has a pH = 3.50.  What is the value of the ionization constant Ka for this acid?

Which of the following is the expression for the solubility product of copper(II) hydroxide?  

You have 500.0 mL of a buffer solution containing 0.30 M ammonia (NH3) and 0.20 M ammonium chloride (NH4Cl).  What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution?  [Kb = 1.8 x 10-5]