show work please! Answer the following questions for the titration of SO 00 mL o

Question

show work please!

Answer the following questions for the titration of SO 00 mL of 0 0200 M HALp 6.27) with 0.100 M NaOH 0) What is the volume of NaOH needed to equivalence point? 1) What is the pH of the solution before any base is added? 2) What is the pH of the solution before after 3.00 ml of base is added 3) What is the pH of the solution at the haif of the equivalence poienti 4) What is the pH of the solution at the equivalence point? 5) What is the pH of the solution after adding 0.10 mL more base than equivalence point?

Explanation / Answer

mmoles of HA = 50 x 0.0200 = 1.0

0)

mmoles of HA = mmoleso f NaOH

1 = 0.100 x V

V = 10 mL

volume of NaOH needed = 10.00 mL

1)

pH = 1/2 (pKa - log C)

    = 1/2 (6.27 - log 0.0200)

pH = 3.98

2)

mmoles of NaOH = 3 x 0.1 = 0.3

HA    +   NaOH   -------------> NaA   + H2O

1              0.3                            0           0

0.7              0                            0.3

pH = pKa + log [salt / acid]

   = 6.27 + log [0.3 / 0.7]

pH = 5.90

3)

pH = pKa at half - equivalence point

pH = 6.27

4)

here salt reamains.

salt concentration = 1 / 50 + 10 = 0.0167 M

pH = 7 + 1/2 (pKa + log C)

     = 7 + 1/2 (6.27 + log 0.0167)

pH = 9.25

5)

pH = 10.22

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.