Explain the signal is linear over the measured absorptions

Reference no: EM13564800

Duplicate 0.50 g samples of a finely powdered gold ore are digested in an HCl/HNO3 mix and evaporated to dryness. Each sample is then treated with an additional 15 mL of HCl and diluted with an additional 40 mL of water. To one sample a 1.00 ml volume of a gold standard containing 5.0 ug/mL of gold is then added. Both samples are then treated with 5 mL of concentrated HBr to produce a gold bromide complex, and this is then extracted into 5 mL of methylisobutyl ketone. The atomic absorption signals were A=0.22 for the unspiked sample and 0.37 for the sample spiked with the additional gold standard. Assuming that the signal is linear over the measured absorptions, what is the concentration of gold in the original sample in ug/g?

Reference no: EM13564800

Questions Cloud

Explain molarity of a sodium hydroxide solution determined : why the molarity of a sodium hydroxide solution cannot be determined by simply weighing out a sample of solid NaOH, dissolving it in a known amount of water, and calculating its molarity based on the molar mass of MaOH and the overall volume of so..

Estimate what is the change in internal energy of the system : A gas enclosed in a container fitted witha piston ofcross-sectional area .10m^2. If 42 J of energy is added to the system by heat duringthe expansion what is the change in internal energy of the system

Define scholarly source : Define scholarly source and give two examples of non-scholarly sources - Identify the logic flaws in this statement: "Everyone knows soccer players are too weak to play a real sport."

Determine what is its rotational kinetic energy : An airplane propeller is 2.02 min length (from tip to tip) with mass 109 kg. The propeller is rotating at 2000 rev/min about an axis through its center. What is its rotational kinetic energy

Explain the signal is linear over the measured absorptions : The atomic absorption signals were A=0.22 for the unspiked sample and 0.37 for the sample spiked with the additional gold standard. Assuming that the signal is linear over the measured absorptions, what is the concentration of gold in the original..

Things fall apart by chinua achebe : How does society in Umuofia change over the course of their lifetimes? How does the title of the piece come into play?

Explain ratio observed with the nitration of bromobenzene : If an organic chemist nitrated chlorobenzene, would the ortho:para ratio be less than, equal to, or greater than the 38:62 ratio observed with the nitration of bromobenzene

Explain the final temperature of water and pieces of metals : A 29.95g piece of iron and a 21.40g piece of gold of 100C were dropped into 820mL of water at 25.85C. The molar heat capacity of iron is 25.19J/mol*C and 25.41C/mol*C of gold. What is the final temperature of water and pieces of metals

Explain the two nuclei within potassium fluoride : Which are closer together: the two nuclei within potassium fluoride, KF, or the two nuclei within molecular fluorine, F2. Explain.

User Account

All Pages