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The concentration of iron(III) can be determined by adding excess thiocyanate (SCN-) to an aqueous solution. This results in the formation of the highly colored FeSCN2+ complex ion. To do this analysis, a standard solution containing 5.00x10^-5 M Fe3+ was prepared. After addition of excess SCN-, the absorption of the standard solution =0.363 at 580 nm.
To determine [Fe3+] in an unknown solution, 1.00 mL of the solution was diluted to 50.0 mL. After addition of excess SCN-, the absorption of the standard solution =0.193 at 580 nm. What is the [Fe3+] in the ORIGINAL (UNDILUTED) solution?
The steam is then sent back to the boiler (constant pressure heat exchanger) and reheated to 300oC. In a secondary turbine, the steam is expanded to 10kPa.
A compound is composed of elements C, H, and N. A 11.550-mg sample of the unknown compound was combusted, producing 31.332 mg of CO2 and 8.983 mg of H2O. What is the empirical formula for this compound
The simplest carbene known is methylene. The non-bonded electrons can be paired (singlet methylene) or unpaired (triplet methylene).
A tank at is filled with of sulfur hexafluoride gas and of carbon monoxide gas. You can assume both gases behave as ideal gases under these conditions.
A gas sample in a piston assembly expands, doing 588 kJ of work on its surroundings at the same time that 372 kJ heat is added to the gas.
How many grams of copper are in the necklace? 3. If 18-karat gold has a density of 15.5 , what is the volume in cubic centimeters?
A 370. mL air sample collected at 35°C has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 49°C.
1. What are the shapes of the NMe4+, [I3]- and [I5]- ions? The hybridization of the atoms?
Calculate the pH of a buffer solution made by mixing 34 ml of a 0.11 M potassium acetate solution with 63 ml of a 0.10M acetic acid solution. Give the pH to two decimal places.
Benzoic acid is a weak acid that has antimicrobial properties. Its sodium salt, sodium benzoate, is a preservative found in foods, medications, and personal hygiene products. Benzoic acid dissociates in water: C6H5COOH C6H5COO- + H+
Describe the process design and application - Water and Wastewater Treatment
The distance between layers in a crystal is 323 pm. X rays are diffracted from these layers at an angle of 13.1°. Assuming that n = 3, calculate the wavelength of the X rays in nm.
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