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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.
Plot pH values as a function of volumes of added KOH and suggest appropriate indicators for the titration.
A smple of mixture of NaCl, Caco3 and SiO2 weighed 7.30 grams. During the water wash the sample lost 2.21 grams. After treatment with HCL, the sample weighed 2.05 grams.
if 0.55 g of a gas dissolves in 1.0 l of water at 20.0 kPa of pressure, how much will dissolve at 110.0 kPa of pressure?
A 4.07 L sample of H2O(g) reacts at a temperature of 375°C and a pressure of 679 mm Hg. How many grams of NH3 can be produced?
A proton in a linear accelerator has a de Broglie wavelength of 155 pm. what is the speed of the proton?
How many double bonds are present in the "best" resonance structure of the phosphate ion?
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8) (b) 0.115 M HONH3Cl
The blue color of dextran blue solution is due to the well-known, blue complex formed between starches and iodine. If you only had the absorption spectrum of this solution
what volume will it occupy? Assume constant pressure. Note the temperatures are given in two different units. Be sure to change each to deg K first.
Discuss what you would observe after elution and visualization of a TLC plate having made the following mistakes in carrying out the analysis. Conceptual Organic chemistry
a 125 g sample of an unknown metal requires 1351 j of energy to heat it from 25 degrees celcius to 112 degrees celcius. what is the specific heat capacity of the unknown metal.
Sodium saccharin, is a nucleophile, but DMF is not. Explain why
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