A) Given the following information: (1) Write the net ionic equation for the rea

Question

A) Given the following information:

(1) Write the net ionic equation for the reaction that occurs when equal volumes of 0.232 M aqueous hydrocyanic acid and sodium benzoate are mixed. It is not necessary to include states such as (aq) or (s).

(2) At equilibrium the _________reactants or products will be favored.

(3) The pH of the resulting solution will be _________greater than or equal to or less than seven.

B) Given the following information:

(1) Write the net ionic equation for the reaction that occurs when equal volumes of 0.264 M aqueous hydrocyanic acid and sodium benzoate are mixed. It is not necessary to include states such as (aq) or (s).

(2) At equilibrium the _________reactants or products will be favored.

(3) The pH of the resulting solution will be _________greater than or equal to or less than seven.

Explanation / Answer

A.

1.

HCN + C6H5COO- = CN- + C6H5COOH

2. HCN as an acid is weaker than C6H5COOH (see Ka) . As a base C6H5COO- is weaker than CN-. At equilibrium the reactants are favored.

3. The pH will be close to 7 , but the exact value is

pH = (pKa1 + pKa2)/2 = 6.8 (pay attention here!)

B. identical answers, the concentration is not relevant here

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