Question

Constants Periodic Table Learning Goal: To understand the relation between the strength of an acid or a base and its pK and pKb 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, Ka For the generic weak acid, HA, pKa log K Another way to express base strength is by using pKb pK log K НА(аg) — А (аq) + н (аq) and the acid-ionization constarnt is given by A H К. — НА Part A 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 Similarly, the degree with H2O in solution is given by its base-ionization constant, K For the generic weak base, B which a weak base reacts To find the pK of X-281, you prepare a 0.095 Mtest solution of X-281 at 25.0 °C. The pH of the solution is determined to be 2.40. What is the pK of X-281 В(аq) + H,0() — Bн" (aq) + Он (аq) Express your answer numerically. and the base-ionization constant is given by View Available Hint(s) внон К, — B Hνα ΑΣφ рК, . Submit Previous Answers X Incorrect; Try Again; 3 attempts remaining Part B Complete previous part(s)

Answer 1

HA Inauid tom Lon biloedpay Ht Cap) tA Cag) HA 0.095 (Taiially) C'egailibriury 0-095-) Y aM= 2.40, Ht 10 Ht 3.981 X 10 10-2-40 A=M 3.91X 1o HA (0.095-) C0-095-(3-981X 163 0.091 (n).(n) Ka- 3.981X 103).3.9BIX to) (0.095-M) O09) 1742 10 pea - lo9 (ka) 09 (1-72X10 3-76

If you have any questions please comment

If you satisfied with the solution please rate it thanks