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The elemental selenium dispersed in a dandruff control shampoo was determined by suspending a 10.0 mL sample in a warm ammonical solution that contained an excess of silver nitrate to give the following:
6 Ag? + 3Se(s) + 6NH3 + 3H2O → 2 Ag2Se(s) + AgSeO3(s) + 6NH4?
The mixed precipitate was filtered and washed free of excess Ag?. Treatment with excess nitric acid dissolved the AgSeO3 but not the Ag2Se. The Ag? produced from the dissolution of the AgSeO3 required 19.4 mL of 0.0166M KCl to reach the equivalence point in the titration of silver with chloride (Al? + Cl?→AgCl(s) ). How many milligrams of Se were there per milliliter of shampoo?
explain why the vitamin tablet is crushed before titrating with the iodate titrant.
iodine clock reaction experiment, between iodide ions and persulfate ions, why should the rate orders w.r.t iodide and persulphate ions be integers(and therefore we can round off the experimental value to the closest integers)? I actually performe..
Why is it important to use lambda max (measured from spectroscope)? What I am unclear about is why it is important to know it before creating a standard curve?
Assume each of the following: the fuel has an average formula of C7H16 ; 15% of the heat generated from combustion goes to heat the water (the rest is lost to the surroundings); the density of the fuel is 0.78 g/mL; the initial temperature of the ..
At a particular temperature, Kp = 0.25 atm for the reaction N2O4(g) 2NO2(g) a. A flask containing only N2O4 at an initial pressure of 4.5 atm
Calculate the percent yield for a student who completed experiment 27A and collected the following data. Give your answer to two decimal places.
at a particular temperature, N2O5 decomposes according to a first-order rate law with a half-life of 3.0s. If the initial concentration of N2O5 is 1.0x10^-6 molecules/cm^3, what will be the concentration in molecules/cm^3 after 26.1s
A 0.325 mol sample of PCl5(g) is injected into an empty 4.15 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.
Calculate the pH of a solution that has an ammonium chloride concentration of .05 M and a sodium acetate concentration of .045 M
If a wheelchair-marathon racer moving at 13.3 miles per hour expends energy at a rate of 635 Calories per hour, how much energy in Calories would be required to complete a marathon race (26.2 miles) at this pace
At 400 K, an equilibrium mixture of H2, I2, and HI consists of 0.015 mol H2, 0.012 mol I2, and 0.025 mol HI in a 4.50-L flask. What is the value of Kp for the following equilibrium? (R = 0.0821 L · atm/(K · mol))2HI(g) H2(g) + I2(g)
for the reaction represented by the equation cl2 2kbr reg 2kcl br2 calculate the percentage yield if 200. g of
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