Which of these statements is not true of buffer solutions?
A buffer solution could consist of equal concentrations of ammonia and ammonium bromide.
A buffer solution could consist of equal concentrations of nitric acid, HNO3, and sodium nitrate.
A buffer solution will change only slightly in pH upon addition of acid or base.
In a buffer solution containing benzoic acid, C6H5COOH, and sodium benzoate, C6H5COONa, the species that reacts with added hydroxide ion is the benzoic acid.