A 20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to reduce all dissolved iron to Fe(II),0- phenanthroline is added and the aliquot is diluted to 50 ml and the absorbance in a 2.00 cm cell is 0.085 at 510 nm. Calculate the iron content of the water as ppm? ε = 1.11 x104 L/mol cm

A 20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to reduce all dissolved iron to Fe(II),0- phenanthroline is added and the aliquot is diluted to 50 ml and the absorbance in a 2.00 cm cell is 0.085 at 510 nm. Calculate the iron content of the water as ppm? ε = 1.11 x104 L/mol cm

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter19: Complex Ions

Section: Chapter Questions

Problem 51QAP: A child eats 10.0 g of paint containing 5.0% Pb. How many grams of the sodium salt of EDTA,...

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A child eats 10.0 g of paint containing 5.0% Pb. How many grams of the sodium salt of EDTA, Na4(EDTA)should he receive to bring the lead into solution as Pb EDTA?
A 20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to reduce all dissolved iron to Fe(II),0- phenanthroline is added and the aliquot is diluted to 50 ml and the absorbance in a 2.00 cm cell is 0.085 at 510 nm. Calculate the iron content of the water as ppm? ε = 1.11 x 104 L/mol cm
The absorbance of a solution containing 5.0 x 10^-3 g/L of a solute in a 1.00 m cell is 1.00. Calculate the absorptivity and the molar absorptivity if the molecular mass of the solute is 1.25.
If you have a sample of 42.6 mg/L of calcium and 7.2 mg/L of magnesium, what concentration does the titrant have to have to spend 15.00 mL of EDTA and 25.00 mL of sample?
To determine the concentration of an EDTA solution, the following magnesium(II) solution is prepared: metallic magnesium (m(Mg) = 0.5915 g) is dissolved in dilute sulfuric acid, the resulting solution is poured into a volumetric flask with a volume of 0.250 L and is filled to the graduation mark with water. The titration of an aliquot of magnesium(II) solution with a volume of 25.00 ml consumes (11.11 ml; 11.32 ml; 11.24 ml; 11.29 ml) of EDTA. Calculate the concentration of EDTA solution with accuracy corresponding to the starting data, give confidence interval.
Calculate the molar absorptivity of a 1.00 x 10-4 M solution, which has an absorbance of 0.372, when the path length is 2.5 cm.
Calcium in powdered milk is determined by dry ashing a 3.00g sample then titrating the calcium with 12.10mL EDTA solution. The EDTA was standardized by titrating 10.00mL of a Zn solution by dissolving 0.632g Zn metal in acid and dilution to 1.00L (10.80 mL EDTA required for titration). What is the concentration of Ca in the powdered milk in ppm?
A student prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. Using the standard curve above, if the absorbance for the solution was 0.562, calculate the equilibrium constant, Keq.
As part of a geological team that studied a local cave, you brought with you a bunch of 1.00 g rock samples to be studied. Each rock was prepared and titrated against 0.050 M EDTA.a. Calculate the percent calcite (CaCO3) content of rock A if it was titrated with 48.0 mL EDTAb. Calculate the percent brucite (Mg(OH)2) content of rock B if it was titrated with 76.5 mL EDTA
In the determination of iron in fortified cereals by atomic absorption, 0.9133 g of sample was weighed. After a previous treatment, it was dissolved and diluted to 100 mL, an aliquot of 25.0 mL was taken, this was diluted to 100 mL and this solution presented an absorbance reading of 0.251. A series of iron standards of the following concentrations were prepared: 0.0; 1.0; 2.0; 2.5 and 3.0 ppm. Whose absorbances were 0.0; 0.241; 0.405; 0.520 and 0.640. Determine the iron concentration in mg/100 g of sample.
In a pharmaceutical industry a drug Paracetamol (151.163 g/mol) is determined in a sample. A 0.0315 g samples was reacted with methanol and diluted the solution to 1 L. the solution λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.642 in a 2 cm cell. Calculate the percentage paracetamol in the sample.
The iron content of a municipal water supply was determined by an atomicabsorption procedure. The absorbance of the water, after a five-fold dilution, was0.755 at 248.3 nm. A standard solution, prepared by dissolving 0.2018 g of pureiron wire in acid, diluting to 250.0 mL, and then making a 100-fold dilution, hadan absorbance of 1.015. Calculate the ppm Fe in the water sample