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Phenobarbital Sodium Solubility and Precipitation Quiz

10 Questions

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Phenobarbital Sodium Solubility and Precipitation Quiz

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Questions and Answers

What phenomenon is described when a solute is more soluble in a mixture of solvents than in one solvent alone?

Deliquescence

Hygroscopy

Efflorescence

Cosolvency (correct)

How does the addition of alcohol to a buffered aqueous solution of a weak electrolyte affect the solubility of the un-ionized species?

Has no effect on its solubility

Forms a precipitate

Decreases its solubility by increasing dissociation

Increases its solubility by adjusting solvent polarity (correct)

How does alcohol, when added to water, impact the dissociation of a weak electrolyte in a buffered solution?

Has no effect on dissociation or solubility

Increases dissociation and raises solubility

Decreases dissociation and lowers solubility (correct)

Forms a chemical bond with the solute

What happens to the solubility of a weak base as the pH of the solution is increased?

It begins to precipitate from the solution. Signup and view all the answers

How does the Henderson-Hasselbach equation relate pH and pKa to acid and its salt concentrations?

When [A-] = [HA], the system's pH equals pKa. Signup and view all the answers

How is the pHp defined in relation to the solubility of acids and bases?

It is the pH below which an acid or above which a base will begin to precipitate. Signup and view all the answers

What is the pH below which free phenobarbital will begin to separate from a solution?

8.24 Signup and view all the answers

In the context of drug solubility, what does a pH of 9.03 indicate?

High solubility of the drug Signup and view all the answers

How does a weak electrolyte behave in a solution where the pH makes the drug entirely ionic?

Behaves as a strong electrolyte Signup and view all the answers

What is the significance of pKa in determining the solubility behavior of weak acids or bases?

Indicates the strength of the acid or base Signup and view all the answers