Define dissolved oxygen involves the treatment of the sample

Reference no: EM13174825

The Winkler titration for the determination of dissolved oxygen involves the treatment of the sample with iodide ion (I-) in the presence of manganese ion catalyst (Mn2+) as follows.

O2 + 2Mn2+ + 4OH- => 2MnO2(s) + 2H2O

MnO2(s) + 4H+ + 2I- => Mn2+ + I2 + 2H2O

The liberated iodine is then titrated with a standard thiosulfate solution.

I2 + 2S2O3^2- => 2I- + S4O6^2-

A 50.00 ml sample of water was treated as above and the I2 titrated with 0.01136 M Na2S2O3, of which 8.11 ml were required to reach the end point. Determine the concentration of the dissolved O2 in M (moles/L) and ppm (mg/L).

Reference no: EM13174825

Questions Cloud

Calculate the molarity of the sodium edta solution for each : Using the volumes of sodium EDTA solution you just entered and the corresponding calcium carbonate masses entered earlier, calculate the molarity of the sodium EDTA solution for each trial.

Explain analytical molar concentrations of ha species : In an aqueous solution that contains 285 mg of trichloroacetic acid (HA), Cl3CCOOH (163.4 g/mol) in 10.0 ml. Calculate: 1) Analytical molar concentrations of HA species

How many moles of gas did the system gain or lose : A gas occupies 22.4 L at STP and 14.5L at 100 C and 2.00 atm pressure. how many moles of gas did the system gain or lose?

Describe the shape around the central atom designated : Give the bond angle and describe the shape around the central atom designated in this molecule.

Define dissolved oxygen involves the treatment of the sample : The Winkler titration for the determination of dissolved oxygen involves the treatment of the sample with iodide ion (I-) in the presence of manganese ion catalyst (Mn2+) as follows.

Diebolds accounting for accrued liabilities : Diebold's accounting for accrued liabilities and capitalized expenses and what the auditors could have done differently to identify the misstatements in the earlier years of the fraud.

Major philosophical concept : A major philosophical concept, , deals with basic human character¬istics and similar traits in other beings like chimpanzees and dolphins.

Explain the acid was then neutralized : The arsenic in a 1.223 g sample of a pesticide was converted to H3AsO4 by suitable treatment. The acid was then neutralized, and 40.00 ml of 0.07891 M AgNO3 was added to precipitate the arsenic quantitatively as Ag3AsO4.

Compute the percent of ionization of ha : Question one: A certain weak acid has, HA, has a Ka value of 8.3*10^-7. Calculate the percent of ionization of HA in a .10 M Solution.

User Account

All Pages