Learning Goal: To understand the relation between the strength of an acid or a b

Question

Learning Goal: To understand the relation between the strength of an acid or a base and its p K a and p Kb values. The degree to which a weak acid dissociates in solution is given by its acid-ionization constant. K a. For the generic weak acid. HA: HA(aq) A - (aq) + H - (aq) and the acid-ionization constant is given by Ka = [A -] [H +]/[HA] Similarly, the degree to which a weak base reacts with H2O in solution is given by its base-ionization constant, Kb. For the generic weak base, B, B(aq) + H2O (l) BH+ (aq) + OH - (aq) and the base-ionization constant is given by Kb = [BH -] [OH -]/[B] Another way to express acid strength is by using p K a: pKa = - log Ka Another way to express base strength is by using p Kb: pKb = - log Kb A new potential heart medicine, code-named X-281. is being tested by a pharmaceutical company, Pharma-pill. As a research technician at Pharmapill, 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 pK A of X-281. you prepare a 0.84 M test solution of X-281. The pH of the solution is determined to be 2.70. What is the pK a of X-281? Express your answer numerically. This part will be visible after you complete previous item(s).

Explanation / Answer

the new answer i got is 4.32.

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