PH of a buffer

Hi, could anyone help with this. I know its properly simple but I cant get my head round it. Thanks

Find the PH of a buffer made by mixing 100cm3 of 0.100 molar benzoic acid (PKa = 4.202) and 200cm3 of 0.050 molar sodium benzoate.

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buffer can be seen in

buffer can be seen in http://www.lookchem.com/cas-50/50-01-1.html

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