Journal Entry:

What is the molar solubility of BaSO4_(s) in water? The K_sp of BaSO4_(s) is 1.1 x10^-10.
(A) 5.5 x10^-11 M
(B) 1.10 x 10^-10 M
(C)1.0 x 10^-5 M
(D)5.5 x 10^-5 M

Learning Intentions

• We will learn the difference between the different kinds of equilibrium problems including gas, solubility and acid-base.

• We will learn how to calculate K for a reaction in equilibrium for all different type of equilibrium problems.

• We will learn how to use ICE to determine variables in the equilibrium expression.

• We will learn how to determine equilibrium constants when you add or combine equations.

• We will learn how to determine the solubility of a salt or strength of an acid or base based on its equilibrium constant.

Closing Task:

You can distinguish between types of equilibrium problems, write the proper equilibrium expression for each type and solve problems associated with using the expressions.

Content Standards being covered:

When a system is at equilibrium, all macroscopic variables, such as concentration, partial pressures, and temperature, do not change over time. Equilibrium results from an equality between the rates of the forward and reverse reactions, at which point Q=K. (E.K. 6.A.3)

Chemical equilibrium reasoning can be used to describe the proton-transfer reactions of acid-base chemistry. (E.K. 6.C.1)

The solubility of a substance can be understood in terms of chemical equilibrium. (E.K.6.C.3)