# What is the [H_3 O^+] and the pH of a benzoic acid-benzoate buffer that consists of...

###### Question:

What is the [H_3 O^+] and the pH of a benzoic acid-benzoate buffer that consists of 0.13 M C_6 H_5 COOH and 0.45 M C_6 H_5 COONa? (K_a of benzoic acid = 6.3 times 10^-5) Be sure to report your answer to the correct number of significant figures. [H_3 O^+] = times 10^ M pH =

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