calculate pH if an aqueous solution of 0.200 M acetic acid the strongest acid? d

Question

calculate pH if an aqueous solution of 0.200 M acetic acid the strongest acid? d) dihydrogen phosphate ion, K -6.2x 10 a) acetic acid, K,-1.8 x 10* llg is b) benzoic acid, K,-6.3 x10 ) formic acid, K,-1.8 x 1 hat is the OH concentration of a solution with a pH of 10.35? e) hydrocyanic acid, K,-4.0x 101 a)1.6x10-9 M b) 2.7 × 10-8 M B6. Which of the following weak acids has the c) 6.5 x 10-6 M d) 2.2 × 10-4 M e) a)acetic acid, K.-1.8×10-5 d) dihydrogen phosphate ion, K b) benzoic acid, K.-6.3 x 10", b) benzoic acid, K,-63×10-, c) formic acid&-1.8 c) torme acid, K 10-10 -40 6.2 x 10 e) hydrocyanic acid, Ka-4.0 x 10 B7. Which of the following species is the weakest acid? a) HBr b) HCI d) HF e) HAt c) HI B8. All of the following statements concerning buffers are true EXCEPT a) buffers are resistant to changes in pH upon the addition of strong acids. b) buffers are resistant to changes in pH when diluted with water. e) the pH of a buffer is close to the pK, of the weak acid from which it is made. d) buffers contain appreciable quantities of a weak acid and its conjugate base. e) buffers are used as colored indicators in acid-base titrations. B9. Which of the following conditions is true for a titration of a strong acid with a weak bas a) The equivalence point occurs at a pH greater than 7. b) The equivalence point occurs at a pH equal to 7. c) The equivalence point occurs at a pH below 7. d) Equal volumes of acid base are required to reach the equivalence point. e) None of the above. B10. The Kip for BaF is 1.7 x 10%. What is the concentration of Ba+ in a saturated solutic c) 1.0 x 10-2 M a)5.7 x 10-7Mb) 1.7×10-6 M d) 1.3 × 10-3 M e) 7.5 × Bl1. Which of the following substances is likely to have the highest standard entropy in c) CHOH d) CH12 e) Csl

Explanation / Answer

(B4) Ka represents the acid dissociation constant, which indicates the ability of the acid to under goes dissociation to furnish H+ ion. More is the value of Ka more becomes the availability of H+ ion and hence more becomes the acidic strength of the acid. In this light, formic acid having a relatively higher Ka value becomes the strongest acid.

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