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A 0.4672 g sample of pewter (containing tin, lead, copper, and zinc) was dissolved in acid. The precipitate SnO2·4H2O was removed by filtration. The resulting filtrate and washings were diluted to a total volume of 250.0 mL. A 15.00 mL aliquot was buffered and titration of the lead, copper, and zinc required 35.78 mL 0.001500 M EDTA. Thiosulfate was used to mask the copper in a 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.06 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a 25.00 mL aliquot. Titration of the lead required 26.68 mL of the EDTA solution. Determine the composition by mass of the pewter sample. By %
World energy supplies are often measured in the unit of quadrillion British thermal units (1012 Btu), generally called a "quad." In 2015, world energy consumption is projected to be 5.81 ×1017kJ.
Calculate the percent yield of the reaction of 205 grams aluminum hydroxide with 751 grams hydrogen sulfate (sulfuric acid), given that 252 grams aluminum sulfate are produced
Calculate the molarity (mol/L) of CO32- when SrCO3 is placed in a 0.0340 M SrCl2 solution. The equation represents the solubility process.
calculate the heat in joules released by the dissolving salt. Assume that the specific heat of the solution is the same as thar of pure water(4.184J/g- celcius) and that the calorimeter is perfect.
Write down the formulas relating (a) frequency and wavelength, (b) Wavelength and momentum, and (c) energy and frequency of a photon.
A free electron initially at rest at the back of Cathode ray tube in your television accelerate through a potential
If 3.70 mol of ethane, C2H6, undergo combustion according to the unbalanced equation given below, how many moles of oxygen are required? C2H6 + O2-> CO2 + H2O
Calculate the mass percent of a solution that is prepared by adding 61.3g of NaOH to 492g of H2O.
A colored substance Z has an absorption maximum at 350 nm. A solution containing 2 mg of Z per liter had an absorbance of 0.850 using a 1 cm cell. The formula weight of Z is 148.
Write the correct equation for the oxidation of zinc in 0.1 M hydrochloric acid. (WITH EXPLANATION PLEASE)
What is the charge on magnesium iodide? What does the charge on the magnesium ion have to do with the number of valence electrons that an atom of magnesium has?
find the vapor pressure of a water solution in which the mole fraction HgCI2 (a nonvolatile solute) is 0.163 at 25.
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