7. For each of the following weak acid:conjugate base pairs, assume a buffer mix

Question

7. For each of the following weak acid:conjugate base pairs, assume a buffer mixture is prepared and it is reacted with either a strong acid or a strong base. Write:

Reaction a. A balanced net ionic equation for the reaction that will occur if a strong acid is added to the pair that neutralizes the added acid.

Reaction b. A balanced net ionic equation for the reaction that will occur if a strong base is added to the same pair that neutralizes the added base.

Note: There is only 1 reaction for a and only 1 reaction for b in each part below and only the net ionic equation should be written!!

1.HC2H3O2 : C2H3O2-

      Reaction a:

Reaction b:

2. CH3CHOHCH2SH :   CH3CHOHCH2S-

Reaction a:

Reaction b:

3.CH3CH=CHCH2NH3+ : CH3CH=CHCH2NH2

Reaction a:

Reaction b:

Explanation / Answer

1)   strong acid react with conjugate baseand strong base react with acid .

reaction a ) acid added :   C2H3O2- +   H+ ---------------------> C2H3O2H

reaction b ) base added : C2H3O2H + OH- -----------------------> C2H3O2- + H2O

2)

reaction a ) acid added   : CH3CHOHCH2S- + H+ -------------------- > CH3CHOHCH2SH

reaction b ) base added : CH3CHOHCH2SH + OH- -----------------------> CH3CHOHCH2S-   + H2O

3)

reaction a ) acid added   : CH3CH=CHCH2NH2 + H+ -------------------> CH3CH=CHCH2NH3 +

reaction b ) base added   :CH3CH=CHCH2NH3 + + OH- --------------> CH3CH=CHCH2NH2 + H2O

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