Review I Censtanta I Periodic Tab Learning Goal: To understand the relation between the strength of an acid or a base and its pk, and pk values. Another way to express acid strength is by using pk. The degree to which a weak acid dissociates in solution is given by its acid-ionization conatant. K. For the generic weak acid. HA. pK. log K. HA(M4) -- A (a4) + H*(aq) Another way to express base strength is by using pks: pk. =- log K. and the acid-ionization constant is given by JA H K. TAI • Part A Similarly, the degree to which a weak base reacts with H,O in solution is given by its base- ionization conatant. K For the generic weak base. B. B(aq) + H,O(1) - BH (aq) i OH (aq) A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pil. As a research technician at Pharma-pil, you are told that X-281 is a monoprotio weak acid, but because of security concerns. the actual chemical formula must remain top secret. The company is interested in the drug's K, value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. and the base-lonization constant is given by To find the pk, of X-281. you prepare a 0.003 M test solution of X-281 at 25.0 "C. The pH of the solution is determined to be 3.00. What is the pK, of X-281? Express your answer numerically. BH ||OH K» > View Available Hints) pK, - 400 Submit Previous Answer v Correct Conjugate pairs At 25 "C, for any conjugate acid-base pair pk. + pks = 14.00 • Part B What is pk, of the conjugate base of X-2817 (Assume 25 "C.) Express your answer numerically. > View Available Hint(s) VO AX pK Submit
Review I Censtanta I Periodic Tab Learning Goal: To understand the relation between the strength of an acid or a base and its pk, and pk values. Another way to express acid strength is by using pk. The degree to which a weak acid dissociates in solution is given by its acid-ionization conatant. K. For the generic weak acid. HA. pK. log K. HA(M4) -- A (a4) + H*(aq) Another way to express base strength is by using pks: pk. =- log K. and the acid-ionization constant is given by JA H K. TAI • Part A Similarly, the degree to which a weak base reacts with H,O in solution is given by its base- ionization conatant. K For the generic weak base. B. B(aq) + H,O(1) - BH (aq) i OH (aq) A new potential heart medicine, code-named X-281, is being tested by a pharmaceutical company, Pharma-pil. As a research technician at Pharma-pil, you are told that X-281 is a monoprotio weak acid, but because of security concerns. the actual chemical formula must remain top secret. The company is interested in the drug's K, value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries. and the base-lonization constant is given by To find the pk, of X-281. you prepare a 0.003 M test solution of X-281 at 25.0 "C. The pH of the solution is determined to be 3.00. What is the pK, of X-281? Express your answer numerically. BH ||OH K» > View Available Hints) pK, - 400 Submit Previous Answer v Correct Conjugate pairs At 25 "C, for any conjugate acid-base pair pk. + pks = 14.00 • Part B What is pk, of the conjugate base of X-2817 (Assume 25 "C.) Express your answer numerically. > View Available Hint(s) VO AX pK Submit
Chemistry: Matter and Change
1st Edition
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Chapter18: Acids And Bases
Section: Chapter Questions
Problem 107A
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![<Chapter 16 - Attempt 3
Item 12
12 of 16
I Review | Constants Periodic Table
Learning Goal:
To understand the relation between the strength of an acid or a base and its pK, and pK,
values
Another way to express acid strength is by using pK.:
The degree to which a weak acid dissociates in solution is given by its acid-ionization constant,
K. For the generic weak acid, HA.
pK, =- log K,
НА(аq) — А (аq) + H*(аq)
Another way to express base strength is by using pKb:
pK.
- log K,
and the acid-ionization constant is given by
[A|H*]
[HA]
Ka =
Part A
Similarly. the degree to which a weak base reacts with H20 in solution is given by its base-
ionization constant, K. For the generic weak base, B.
A new potential heart medicine, code-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 K, value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.
B(ag) + H,O(1) - BH+(aq) + OH-(aq)
and the base-ionization constant is given by
To find the pKa of X-281, you prepare a 0.093 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?
[BH+||OH|
Express your answer numerically.
K
B]
> View Available Hint(s)
pK, = 4.06
Submit
Previous Answers
v Correct
Conjugate pairs
At 25 °C, for any conjugate acid-base pair
рК, + pК, — 14.00
Part B
What is pK, of the conjugate base of X-281? (Assume 25 °C.)
Express your answer numerically.
• View Available Hint/s)
)
?
pK =
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Transcribed Image Text:<Chapter 16 - Attempt 3
Item 12
12 of 16
I Review | Constants Periodic Table
Learning Goal:
To understand the relation between the strength of an acid or a base and its pK, and pK,
values
Another way to express acid strength is by using pK.:
The degree to which a weak acid dissociates in solution is given by its acid-ionization constant,
K. For the generic weak acid, HA.
pK, =- log K,
НА(аq) — А (аq) + H*(аq)
Another way to express base strength is by using pKb:
pK.
- log K,
and the acid-ionization constant is given by
[A|H*]
[HA]
Ka =
Part A
Similarly. the degree to which a weak base reacts with H20 in solution is given by its base-
ionization constant, K. For the generic weak base, B.
A new potential heart medicine, code-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 K, value because only the dissociated form of the chemical is active in preventing cholesterol buildup in arteries.
B(ag) + H,O(1) - BH+(aq) + OH-(aq)
and the base-ionization constant is given by
To find the pKa of X-281, you prepare a 0.093 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?
[BH+||OH|
Express your answer numerically.
K
B]
> View Available Hint(s)
pK, = 4.06
Submit
Previous Answers
v Correct
Conjugate pairs
At 25 °C, for any conjugate acid-base pair
рК, + pК, — 14.00
Part B
What is pK, of the conjugate base of X-281? (Assume 25 °C.)
Express your answer numerically.
• View Available Hint/s)
)
?
pK =
Submit
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