1.) A buffer is made by dissolving H₃PO₄ and NaH₂PO₄ in water. Write net ionic equations that show how this buffer neutralizes added acid (HCl) and added base (NaOH).

2.)Which of the following could be added to a solution of sodium acetate to produce a buffer? Briefly explain your answer. - acetic acid - hydrochloric acid - potassium acetate - sodium chloride

3.) Write a chemical equation to summarize what was happening in the solution in the flask in Experiment 2. (Experiment 2: You will exhale through a straw into a solution containing the pH indictor phenol red. Phenol red is purple at pH 8.2 and yellow at pH 6.8. By observing the color change, you should be able to identify how gas elimination helps the body maintain a constant pH.)

3b) Does exhaling CO₂ help raise or lower the pH of the blood? Explain, using the equation you wrote for part (a).

3c) What happens to the position of the equilibrium and pH when blood absorbs added base?