Which of the following mixtures would result in a buffered solution when 1.0 L of each of the two solutions are mixed? Select one: a. 0.2 M NaF and 0.1 M HNO3 b. 0.2 M NaNO3 and 0.1 M HNO3 c. None of these d. 0.2 M HF and 0.1 M HNO3 e. 0.2 M NaOH and 0.1 M HNO