CHEM-102 Exam 3 Review
A new potential heart medicine, code- 4.88
named X-281, is being tested by a
pharmaceutical company, Pharma-pill.
As a research technician at Pharma-pill,
you are told that X-281 is a monoprotic
weak acid, but because of security
concerns, the actual chemical formula
must remain top secret. The company is
interested in the drug's Ka value because
only the dissociated form of the chemical
is active in preventing cholesterol
buildup in arteries.
To find the pKa of X-281, you prepare a
0.076 M test solution of X-281 at 25.0
∘C. The pH of the solution is determined
to be 3.00. What is the pKa of X-281?v
What is the pH of a 0.210 M ammonia 11.29
solution? 0.926%
What is the percent ionization of
ammonia at this concentration?
, CHEM-102 Exam 3 Review
What is the pH of a buffer prepared by 6.248
adding 0.607 mol of the weak acid HA to
0.608 mol of NaA in 2.00 L of solution? 6.029
The dissociation constant Ka of HA is
5.66×10−7. 6.537
What is the pH after 0.150 mol of HCl is
added to the buffer from Part A? Assume
no volume change on the addition of the
acid.
What is the pH after 0.195 mol of NaOH
is added to the buffer from Part A?
Assume no volume change on the
addition of the base.
Calculate the pH of a solution prepared 5.056
by dissolving 0.150 mol of acetic acid
and 0.300 mol of sodium acetate in
water sufficient to yield 1.00 L of
solution. The Ka of acetic acid is 1.76 ⋅
10-5.
A new potential heart medicine, code- 4.88
named X-281, is being tested by a
pharmaceutical company, Pharma-pill.
As a research technician at Pharma-pill,
you are told that X-281 is a monoprotic
weak acid, but because of security
concerns, the actual chemical formula
must remain top secret. The company is
interested in the drug's Ka value because
only the dissociated form of the chemical
is active in preventing cholesterol
buildup in arteries.
To find the pKa of X-281, you prepare a
0.076 M test solution of X-281 at 25.0
∘C. The pH of the solution is determined
to be 3.00. What is the pKa of X-281?v
What is the pH of a 0.210 M ammonia 11.29
solution? 0.926%
What is the percent ionization of
ammonia at this concentration?
, CHEM-102 Exam 3 Review
What is the pH of a buffer prepared by 6.248
adding 0.607 mol of the weak acid HA to
0.608 mol of NaA in 2.00 L of solution? 6.029
The dissociation constant Ka of HA is
5.66×10−7. 6.537
What is the pH after 0.150 mol of HCl is
added to the buffer from Part A? Assume
no volume change on the addition of the
acid.
What is the pH after 0.195 mol of NaOH
is added to the buffer from Part A?
Assume no volume change on the
addition of the base.
Calculate the pH of a solution prepared 5.056
by dissolving 0.150 mol of acetic acid
and 0.300 mol of sodium acetate in
water sufficient to yield 1.00 L of
solution. The Ka of acetic acid is 1.76 ⋅
10-5.
