Question

The dissolution of calcium hydroxide has a solubility product, Ksp of 5.5 X10^-6at 298 K. The standard enthalpy change is -985.2 kJ/mole and the standard entropy change is 83.4 J/mol.K

1. Write the balanced equation for this dissolution.

2. Write out the equilibrium expression for this process.

3. Find the pH of a saturated solution of calcium hydroxide.

4. What is the standard change in Gibbs Free energy for the dissolution process?

5. You walk into the lab where you are asked to determine the identity of two solutions of the same concentration. You know one is calcium hydroxide and the other is sodium nitrate.  All you have is a thermometer and access to a hot plate and ice.  Outline an experiment that would help you determine the identity of the two solutions. What is the expected outcome based upon what you design?

Problem 3

Hydrogen gas reduces nitrogen oxide to nitrogen gas plus gaseous water in a reaction.

1. Write the balanced equation for the reation.

2. The reaction rates of four initial mixtures of nitrogen gas and nitrogen oxide were measured at 900 ᵒC.  The results are presented in the table below.

Experiment	[Hydrogen gas] (M)	[nitrogen oxide] (M)	Rate (M s-1)
1	0.212	0.136	0.0248
2	0.212	0.272	0.0991
3	0.424	0.5440	0.793
4	0.848	0.544	1.59

Determine the rate law for this reaction at 900ᵒ C.

3. Determine the rate constant at 900ᵒ C.

4. After 180 seconds, what is the concentration of nitrogen oxide gas? Use data from experiment 4.

5. What is the partial pressure of nitrogen oxide gas after the 180 seconds if the volume of the container is 500 mL.  Again use data from experiment 4.

Answer 1

Hello there,

The answer to your first question in the image below

first two problems of 2nd question are as follows

Cheers

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