A sample of water with a Fe2+ concentration of 500 ppm. Additionally Eh is 0.503 V...

A sample of water with a Fe2+ concentration of 500 ppm. Additionally Eh is 0.503 V and pH is 3.45. Will Fe(OH)3(s) stay in solution? What would be the equilibrium Eh at this pH?

Solutions

Expert Solution

Fe(OH)₃ will precipitate if:

The concentration of Fe(III) can be calculated from the Nernst equation, which we present in a simplified version:

So we can rearrange and solve as:

The molar concentration of Fe(II) is:

So we can calculate the concentration of Fe(III):

The concentration of OH^- is given by:

We then have:

The Ksp for Fe(OH)₃ is 6.3x10^-38, which means that we are below it and no precipitate will form.

At this pH, the equilibrium concentration of Fe(III) would be:

The potential would then be (it the concentration of Fe(II) remained the same):

queen_honey_blossom answered 1 year ago

Next > < Previous

Related Solutions

A 236.4 mL sample of water contains 0.0294 g of NaCl. Calculate the concentration in ppm....

A 236.4 mL sample of water contains 0.0294 g of NaCl. Calculate the concentration in ppm. concentration = ___ ppm

A) Calculate the concentration in ppm and the molarity of Cd in a 2.00 mL sample...

A) Calculate the concentration in ppm and the molarity of Cd in a 2.00 mL sample which has been shown to contain 16.4 μg Cd. Assume the sample has a density of 1.00 g/mL.

Calculate the concentration in ppm and the molarity of Cd in a 2.00 mL sample which...

Calculate the concentration in ppm and the molarity of Cd in a 2.00 mL sample which has been shown to contain 16.4 μg Cd. Assume the sample has a density of 1.00 g/mL.

compare the concentration (in ppm) of a particular item in lake water Construct a nova table...

compare the concentration (in ppm) of a particular item in lake water Construct a nova table and determine if the concentrations differ between the lakes lake1 lake2 lake3 12.7 8.3 20.3 9.2 17.2 16.6 10.9 19.1 22.7 8.9 10.3 25.2 6.4 19.9

What is the concentration of Ca2+ in ppm (mg/L) in cave water saturated with calcite (calcium...

What is the concentration of Ca2+ in ppm (mg/L) in cave water saturated with calcite (calcium carbonate, Ksp = 4.7 × 10-9)? Answer:2.7

A sample of water has a hardness of 120 ppm CaCo3. What is the concenttration of...

A sample of water has a hardness of 120 ppm CaCo3. What is the concenttration of Ca2+ in moles/liters? Show Wrok!

Determine the calcium content (in ppm) of a 100.00 mL sample of drinking water if the...

Determine the calcium content (in ppm) of a 100.00 mL sample of drinking water if the following data were obtained. Titrant is 0.0505 M EDTA, 13.49 mL were used when an aliquot of the sample was at pH 13.0, 16.99 mL were used for an aliquot at pH 10.5.

Determine the calcium content (in ppm) of a 100.00 mL sample of drinking water if the...

Determine the calcium content (in ppm) of a 100.00 mL sample of drinking water if the following data were obtained. Titrant is 0.0421 M EDTA, 13.84 mL were used when an aliquot of the sample was at pH 13.0, 19.36 mL were used for an aliquot at pH 10.5.

A 250.0 mL sample of spring water was treated to convert any iron present to Fe2+....

A 250.0 mL sample of spring water was treated to convert any iron present to Fe2+. Addition of 24.00 mL of 0.002543 M K2Cr2O7 resulted in the reaction 6Fe2+ + Cr2O72- + 14H+ ---> 6Fe3+ + 2Cr3+ + 7H2O The excess K2Cr2O7 was back titrated with 8.02 mL of 0.00971 M Fe2+ solution. Calculate the concentration of iron in the sample in ppm.

A geologist examines 22 water samples for magnesium concentration. The mean magnesium concentration for the sample...

A geologist examines 22 water samples for magnesium concentration. The mean magnesium concentration for the sample data is 0.637 cc/cubic meter with a standard deviation of 0.0358. Determine the 95% confidence interval for the population mean magnesium concentration. Assume the population is approximately normal. Step 2 of 2 : Construct the 95% confidence interval. Round your answer to three decimal places.

Subjects