Question

Question 16 O pts Weak acid A has a pK, of 3.2, while weak acid B has a pk, of 5.6. Is Weak acid A or B the stronger of the two? HTML Editora BI AA - E 211 1 *, SE - O N V V V D S 12pt - Paragraph O words

Answer 1

• Stronger the acid, the xmaller the bka yale cand the larger Ka value) The acid dissociation constant (Ka) is a measure of the strength of an acid quantitative in a solution. We have, pka of weak acid A = 3.2. We first calculate the ka of the weak aced A with the help of pka value We know that Ека = – koj Ka Kq = 20 pką - 3.2 ka = 102 [kg = 6.31 x mk for weak acid A pka of weak acid B = 5.6 He know that рка = — log Kя ka = 10 kka kq = 16 ka = 2.51 x 10 for weak acid B

• Of is obvious that acid dissociation constant (Kg) for weak acid A is greater than welk acid B- That is why weak acid A is a stronger acid than weak acid B.