# Part A Barium sulfate, BaSO4, is used in medical imaging of the gastrointestinal tract because it...

## Question:

Part A Barium sulfate, BaSO4, is used in medical imaging of the gastrointestinal tract because it is opaque to X rays. A barium sulfate solution, sometimes called a cocktail, is ingested by the patient, whose stomach and intestines can then be visualized via X-ray imaging. If a patient ingests 280 mL of a saturated barium sulfate solution, how much toxic Ba2+ ion has the patient consumed?

The solubility product Ksp of BaSO4 is 1.10* 10-10.

Express your answer to three significant figures and include the appropriate units.

Part B

There are some data that suggest that zinc lozenges can significantly shorten the duration of a cold. If the solubility of zinc acetate, Zn(CH3COO)2, is 43.0 g/L, what is the solubility product Ksp of this compound?

## Solubility and Solubility Product Constant:

A sparingly soluble salt M{eq}_y {/eq}N{eq}_x {/eq} is in equilibrium with its ions in a saturated solution. The solubility of this sparingly soluble salt is represented by the equation below:

{eq}M_yN_x(s) \rightleftharpoons yM^{x+}(aq)+xN^{y-} {/eq}

The equilibrium constant associated with this solubility equation is called the Solubility Product Constant, Ksp. It is equal to the product of the concentration of the ions raised to their individual coefficient in the balanced reaction. Ksp can also be represented by the molar solubility of the sparingly soluble salt in which the molar solubility s is equal to the equilibrium concentration of the ion divided by the coefficient of the ion, or the equilibrium concentration of the ion is equal to the product of the molar solubility and the coefficient of the ion in the balanced equation.

{eq}Ksp=[M^{x+} ]^{y}[N^{y-} ]^{x}=(y*s)^{y}(x*s)^{x} {/eq}