How would I do this? “ A buffer solution contains 0.400 mol dm-3 benzoic acid ( C6H6COOH) and 0.200 mol dm-3 sodium benzonate (C6H6COOH-Na+) at 25 degrees Celsius, Ka for benzoic acid is 6.40 X 10-5 mol
Calculate the pH of the buffer solution

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost