Question

1.Provide the balanced chemical equilibrium reactions, the Henderson-Hasselbach equations, and the two pKa values for a carbonic acid/ bicarbonate pH buffer and a bicarbonate/carbonate pH buffer.

2.Is the entropy positive or negative for the dissolving of potassium chloride? What does this mean regarding the disorder of the system? Please Explain

3. A number of materials are "hygroscopic" or deliquescent"(means they will absorb water from the atmosphere). Suppose your sample had absrobed water from the air before you weighed it. What effect would this have on the value of deltaHsolution?Why?

Answer 1

1

2

The entropy for dissolving potassium chloride is positive. If a system becomes more disordered, then its entropy increases, in the case of a salt dissolving you are disordering the iones that were closely packed in the solid.

3.

The value would be different that the expected, it will depend on the sign of the enthalpy to assume if it will go up or down. During the absorbtion of water from the solid heat has been either absorbed or released, hence the final enthalpy of the solution will change.