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Posted: **Tue May 31, 2022 11:03 pm**

: 2 Consider The Reaction Of Cyanide Ion Cn With Water Where Cyanide Ion Is Either A Weak Acid Or A Weak Base A Sele 1 (296.13 KiB) Viewed 50 times

2. Consider the reaction of cyanide ion (CN) with water, where cyanide ion is either a weak acid or a weak base. a) Select the correct chemical equation for the acid/base dissociation reaction of cyanide ion in water: OCN- (aq) + H₂O (/) HCN (aq) + H3O+ (aq) OCN- (aq) + H₂O (/) = H₂CN+ (aq) + OH¯ (aq) OCN- (aq) + H₂O (/) = H₂CN+ (aq) + H3O+ (aq) OCN- (aq) + H₂O (/) HCN (aq) + OH- (aq) Incorrect. Tries 3/3 Previous Tries b) The equilibrium expression for this reaction corresponds to: Incorrect Ka Correct: Kb You are correct. Previous Tries Your receipt no. is 152-2641 c) The numerator of the equilibrium expression (from part b) for this reaction is: [HCN ] O[ H₂CN+ ][ OH-] O[OH ][ HCN ] [H₂CN+ ] O[ HCN ][ H3O+] O[H3O+] O[H₂CN+ ][ H3O+] O[OH ][ CN¯ ]
d) The denominator of the equilibrium expression (from part b) for this reaction is: O[ CNT] [ CN¯ ][OH-] [HCN ][ OH¯ ] [H₂CN+ ] O[ CN ][ H₂O ] O[HCN ][ H3O+] [ HCN ] O[OH-] Submit Answer Tries 0/3 3. The pka of pyridinium ion is 5.25 a) Determine the Ka for pyridinium ion. INSTRUCTIONS: Input your answer to TWO (2) significant figures in scientific notation (example: 1.23e4 or 1.23E+04). Submit Answer Tries 0/3 b) Determine the pK, for the conjugate base of pyridinium ion. INSTRUCTIONS: Input your answer to TWO (2) decimal places in standard notation (example: 1.23). Submit Answer Tries 0/3
c) Determine the K, for the conjugate base of pyridinium ion. INSTRUCTIONS: Input your answer to TWO (2) significant figures in scientific notation (example: 1.23e4 or 1.23E+04). Submit Answer Tries 0/3 4. Use the drop-down menu to classify each as either a strong acid, strong base, weak acid or weak base. a) ⒸN(CH3)3 Submit Answer Tries 0/3 b) ⒸH3SO3 Submit Answer ô Submit Answer c) d) Submit Answer Tries 0/3 Bao Tries 0/3 H₂SO4 Tries 0/3
5. Consider the following acids: use the pKa values in the table found HERE to rank the acids in order of inceasing acidity. INSTRUCTIONS: Use the drop-down menus to assign the strongest acid a value of 1, and the weakest acid a value of 3. trifluoroacetic acid Ⓒhydrogen sulfate ion lactic acid Submit Answer Tries 0/3