How can prepare a buffer solution by dissolving, Chemistry

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How can prepare a buffer solution by dissolving

Suppose you prepare a buffer solution by dissolving the 2.00 g each of benzoic acid, HC₇H₅O₂ , and the sodium benzoate, NaC₇H₅O₂, in 750.0 ml of water.
1. Determine the pH of this buffer? Assume that the solution's volume is 750.0 mL.
2. Explain which buffer component, and how much (in grams), would you add to the 750.0 mL of buffer solution to change its pH to 4.00?

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