100 mL of a buffer consisting of 0.25 M CH3COOH and 0.15 M CH3COONa is treated with 10 ml of 0.5 M NaOH. What is the pH of the buffer after the addition of the NaOH? Ka(CH3COOH) = 1.8 x 10-5

Can someone me with questions 12 and 13 plz.

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.