. Sir Bong wants to prepare 2L of 5 mM benzoate buffer pH 5.00. The pKa for benzoic acid, C₆H₅COOH, is 4.20. 1. Identify the buffer components. 2. Give the equilibrium reaction involved. 3. Give the buffering action when the buffer system is added with (a) small amounts of a strong acid and (b) small amounts of a strong base. 4. What mass (in grams) of sodium benzoate (molar mass = 144 g/mol) is needed to prepare the said buffer? Report your answer up to 2 decimal places. Show your complete solution. 5. What mass (in grams) of benzoic acid (molar mass = 122 g/mol) is needed to prepare the said buffer? Report your answer up to 2 decimal places. Show your complete solution.
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A. Sir Bong wants to prepare 2L of 5 mM benzoate buffer pH 5.00. The pKa for benzoic acid, C₆H₅COOH, is 4.20.
1. Identify the buffer components.
2. Give the equilibrium reaction involved.
3. Give the buffering action when the buffer system is added with (a) small amounts of a strong acid and (b) small amounts of a strong base.
4. What mass (in grams) of sodium benzoate (molar mass = 144 g/mol) is needed to prepare the said buffer? Report your answer up to 2 decimal places. Show your complete solution.
5. What mass (in grams) of benzoic acid (molar mass = 122 g/mol) is needed to prepare the said buffer? Report your answer up to 2 decimal places. Show your complete solution.
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