8. Consider the K, values for the following acids: a) Cyanic acid, HOCN, 3.5 x 10- b) Formic acid, HCHO2, 1.7 x 10-4 c)

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8 Consider The K Values For The Following Acids A Cyanic Acid Hocn 3 5 X 10 B Formic Acid Hcho2 1 7 X 10 4 C 1 (344.17 KiB) Viewed 19 times

8. Consider the K, values for the following acids: a) Cyanic acid, HOCN, 3.5 x 10- b) Formic acid, HCHO2, 1.7 x 10-4 c) Lactic acid, HC₂H₂O), 1.3 x 10 d) Propionic acid, HC3H5O2, 1.3 x 10-5 e) Benzoic acid, HC₂H5O2, 6.3 x 10-5 Which has the strongest conjugate base? a. HOCN b. HCHO₂ c. HC₂H5O, d. HC₂H₂O₂ ¢. HC,H,Oz Given initially equimolar solutions of each weak acid, which solution will have the LOWEST pH once equilibrium is established? a. HOCN b. HC₂H5O₂ c. HC₂H₂O₂ d. HC3H₂O₂ e. HCHO₂ Given initially equimolar solutions of each weak acid, which solution will have the HIGHEST pH once equilibrium is established? a. HOCN b. HCHO c. HC₂H₂O₂ d. HC₂H5O e. HCHO₂ Which acid-base reaction results in an acidic solution? HNO3(aq) + CsOH(aq) → H₂O()+CsNO)(aq) HI(aq) + LiOH(aq) → H₂O()+ Lil(aq) HBr(aq) + NaOH(aq) → HzO() + NaBr(aq) HCl(aq) + NH4OH(aq) H₂O()+ NH4Cl(aq) HF(aq) + LiOH(aq)= H₂O()+ LiF(aq) Which of the following combinations would be best to buffer an aqueous solution at a pH of 9.04? H₂PO4 and H₂PO4, Kat-7.5 x 10-³ HNO2 and NO₂, K₁=4.5 x 10-4 CH₂CO₂H and CH₂COO, K₁=1.8 x 10-³ H₂PO4 and HPO4², K₁2=6.2 x 10- NH4 and NH3, K₁=5.7 x 10-10 All the following statements concerning acid-base buffers are true EXCEPT buffers are resistant to pH changes upon addition of small quantities of strong acids or bases. buffers are used as colored indicators in acid-base titrations. the pH of best buffer is close to the pK, of the weak acid from which it is made. buffers contain appreciable quantities of a weak acid and its conjugate base. buffers are resistant to changes in pH when diluted with water. T