session 15 practice

Shown in the image below is the ionization reaction of the conjugate acid of the weak base escitalopram in water and the percent ionization formula.  The pK_a of the conjugate acid of escitalopram is 9.8.

What is the percent ionization of escitalopram in an aqueous solution at pH = 9.0? Enter your answer with two significant figures and do not include the percent sign.

86

Shown in the image below is the ionization reaction of the conjugate acid of the weak base escitalopram in water and the percent ionization formula.  The pK_a of the conjugate acid of escitalopram is 9.8.

What is the percent ionization of escitalopram in an aqueous solution at pH = 10? Enter your answer with two significant figures and do not include the percent sign.

39

Shown in the image below is the ionization reaction of the conjugate acid of the weak base escitalopram in water and the percent ionization formula.  The pK_a of the conjugate acid of escitalopram is 9.8.

Escitalopram will be _____ water soluble in a solution with a pH = 9.0 than a pH = 10. 

more

The pK_a of the conjugate acid of the weak base cocaine is 8.6. The intrinsic aqueous solubility of cocaine (MW = 303.4 g/mol) is 1.8 mg/mL. What is the pH of precipitation for a 40 mg/mL aqueous solution of cocaine hydrochloride (MW = 339.8 g/mol)? Enter your answer with two significant figures.

The image below contains the molarity equation, the solubility equation for a weak base, and the structure of cocaine hydrochloride.

7.3

The pK_a of the conjugate acid of the weak base cocaine is 8.6. The intrinsic aqueous solubility of cocaine (MW = 303.4 g/mol) is 1.8 mg/mL. What is the pH of precipitation for a 40 mg/mL aqueous solution of cocaine hydrochloride (MW = 339.8 g/mol)? Enter your answer with two significant figures.

The image below contains the molarity equation, the solubility equation for a weak base, and the structure of cocaine hydrochloride.

Given the information above in Question 4, a 40 mg/mL aqueous solution of cocaine hydrochloride should be kept ______ your calculated pH of precipitation to keep the drug in solution.

below

Shown in the image below is the ionization reaction of the weak acid losartan in water and the percent ionization formula.  The pK_a of losartan is 5.5. 

What is the percent ionization of losartan in an aqueous solution at pH = 6.0? Enter your answer with two significant figures and do not include the percent sign.

76

To calculate the percent ionization of a substance, it is necessary to determine the number of ions produced and _____ that by the total number of molecules. 

divide

Consider the ionization reaction shown below of benzoic acid (C₆H₅CO₂H), which dissociates into benzoate ions (C₆H₅CO₂^-) and hydronium ions (H₃O⁺) when placed in water. 

If there are 0.05 moles of benzoic acid in a solution, and it dissociates to produce 0.02 moles of benzoate ions and hydronium ions, what is the percent ionization?

Enter only the number. Do not include the percent sign.

40

Percent ionization plays a crucial role in the laboratory, providing valuable information about the behavior and properties of substances in solution.

 

True

 

False

True

Acid X is 25% ionized in an aqueous solution. 

Acid Y is 75% ionized in an aqueous solution.

Which acid is stronger?

 

Acid Y

 

Acid X

Acid Y