If 25.00 mL of 0.200 M HCl is titrated with 0.200 M NaOH, what is the pH of the solution after the addition of 22.50 mL of NaOH

Which of the following solutions will have the greatest buffering capacity given the following concentrations in that solution?

The indicator thymol blue changes from red to yellow between pH 1.2 and pH 2.8. If thymol blue is added to a solution, and the solution turns yellow, then     the pH of the solution must be above 2.8, and the solution is basic.     the pH of the solution must be above 2.8, and the solution is acidic.     the solution is basic, and the pH must be at or below 1.2.     the pH of the solution is above 2.8, and the solution could be acidic, neutral or basic.     the solution is acidic, and the pH must be at or below 1.2.

Consider a solution that contains 0.50 moles of HF and 0.50 moles of NaF in 1.0 L of water. If 0.15 mol of HCI is added to this buffer solution, the pH of the solution will get slightly The pH does not change more drastically because the HNO3 reacts with the present in the buffer system.