1-Citric acid is a triprotic acid (C6H8O7). The pKa values of citric acid are pKa1 = 3.3, pKa2 = 4.76, and pKa3 = 6.4). Predict the titration curve of titrating 10 mL of 0.1 M citric acid against 0.1 M NaOH.

2- Describe the preparation of 2.00 L of 1.50 M HClO4 (100.46 g/mol) from the commercial reagent [71.0% HClO4 (w/w), density 1.67 g/mL].

3-Describe the preparation of 500 mL of 6.25%% (w/v) aqueous ethanol (C2H5OH, 46.1 g/mol).

4-25.0 mL of phosphoric acid (H3PO4 ) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 60.0 mL of the NaOH to reach the full neutralization. What was the concentration in the original H3PO4 solution?

5-25.0 mL of phosphoric acid (H3PO4 ) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 20.0 mL of the NaOH to reach the end point using M.O. What was the concentration in the original H3PO4 solution?

6-25.0 mL of phosphoric acid (H3PO4 ) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 40.0 mL of the NaOH to reach the end point using Ph. Ph. indicator; What was the concentration in the original H3PO4 solution?