A 160.0-mL solution contains 2.15 g of sodium benzoate and 2.79 g of benzoic acid. Calculate the pH of the solution. For benzoic acid, Ka=6.5×10−5. Express your answer using two decimal places.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.