Question

Please answer these 5 questions.

1) a buffer is made by dissolving (CH3NH3)Cl and CH3NH2 in water. Write equations to show how this buffer neutralizes added H3O+ and OH-.

2) If you add 15.0 mL of 1.25 M NaOH to 250. mL of a 0.200 M propanoic acid (CH3CH2CO2H) solution, what is the pH of the resulting solution?

3)If added to 500. mL of 0.20 M NaOH, which of these would form a biffer? Briefly, justify your decision for each and every option below.
            (a) 0.050 mol CH3COOH
            (b) 0.15 mol CH3COOH
            (c) 0.10 mol CH3COOH
            (d) 0.050 mol HCl
            (e) 0.15 mol Na CH3COO

4) Suppose you titrate 0.0300 L of 0.100 M HClO4 with 0.0750 M KOH. Calculate the pH after the addition of the following volumes of KOH solution.
           (a) 0.0 mL
           (b) 25.0 mL
           (c) 40.0 mL
           (d) 55.0 mL
What might be a good indicator to use in order to detect the endpoint of this titration?

5) Suppose you titrate 0.0450 L of 0.200 M trimethylamine (CH3)3N with 0.300 M HNO3. Calculate the pH after the addition of the following volumes of HNO3 solution.
            (a) 0.0 mL
            (b) 10.0 mL
            (c) 30.0 mL
            (d) 45.0 mL
What might be a good indicator to use in order to detect the endpoint of this titration?

Answer 1

These are the ans of 5 questions.