25.00 ml of a 0.2000 mol/l potassium iodide solution in an acid
buffer medium (pH = 1.00) were titrated with a 0.06000 mol/l
potassium dichromate solution. Calculate the value of the
equivalent volume.
Data: Eo (Cr2O72- /
Cr3+) = 1.33 V; Eo
(I3- / I-) = 0.54 V
First we have to calculate the
n factor of respective equations then we know for titration
purposes the normality of titrant and titrand is same so we have to
equalize both normalities and then we have the volume of potassium
dichromate used in reaction.
25.00 ml of a 0.2000 mol/l potassium iodide solution in an acid buffer medium (pH =...
a) A 25.00-mL sample of monoprotic acid was titrated with 0.0800 M potassium hydroxide solution. The equivalence point was reached after 18.75 mL of base was added. Calculate the concentration of the acid. b) A 15.00-mL sample of 0.120 M nitric acid was titrated with 0.0800 M potassium hydroxide. Calculate the pH of the sample when 10.00 mL of the base has been added.
A buffer solution contains 0.120 mole of propionic acid, and 0.110 mole of potassium propionate. the buffer solution has a total volume of 1.00 L a) Find the pH of this buffer solution. b) Find the pH of this buffer solution after the addition of 10.0 mL of 0.400 M KOH solution.
9. A buffer solution was prepared by mixing 12.0 mL of 0.12 mol L lactic acid (HLac) with 18.0 mL of 0.16 mol L sodium lactate (NaLac). Kallactic acid) = 1.4 x104. (10 marks) a) Calculate the pH of the solution. Write all relevant chemical equations. State and verify any assumptions you make. 1/6] b) Two 200-ml buffer solutions were prepared with the same pH using different pairs of compounds, as outlined in the table below. Which of these two...
A buffer solution contains 0.76 mol of propionic acid (HC3H5O2) and 0.65 mol of sodium propionate (NaC3H5O2) in 3.40 L. The Ka of propionic acid (HC3H5O2) is Ka = 1.3e-05. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.18 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.54 mol of HI? (assume...
A 1.00 L buffer solution with pH = 4.74 is composed of 0.30 mol acetic acid and 0.30 mol sodium acetate. A) Determine the pKa of acetic acid B) If 0.030 mol of NaOH is added, determine the pH of the solution
A benzoic acid/potassium benzoate buffer solution has a pH = 4.25. The concentration of benzoic acid (C6H5COOH, Ka = 6.5 × 10-5) in the solution is 0.54 M. What is the concentration of potassium benzoate (KC6H5COO, Kb = 1.5 × 10-10) in this buffer solution?
A benzoic acid/potassium benzoate buffer solution has a pH = 4.25. The concentration of benzoic acid (C6H5COOH, Ka = 6.5 × 10-5) in the solution is 0.54 M. What is the concentration of potassium benzoate (KC6H5COO, Kb = 1.5 × 10-10) in this buffer solution?
A beaker with 1.00×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 mol L−1. A student adds 5.80 mL of a 0.440 mol L−1 HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.
What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M methylamine, CH3NH2, with 25.00 mL of 0.10 M methylammonium chloride, CH3NH3C1? Assume that the volume of the solutions are additive and that Kb = 3.70 times 10-4 for methylamine. 10.27 10.57 10.87 11.78 Which statement about buffers is true? Buffers have a pH = 7. Buffers consist of a strong acid and its conjugate base. A buffer does not change pH on addition of a...
18. A 25.00 ml sample of the 50.00 ml solution was titrated with 0.1359 M potassium thiocyanate and 12.90 mL were required to reach the endpoint. Calculate the gram of silver (MM= 107.87 g/mol) in the sample.