Explain the signal is linear over the measured absorptions

Assignment Help Chemistry
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.

Reviews

Write a Review

 

Chemistry Questions & Answers

  Depict the product obtained when trans-3-octene

Draw the product obtained when trans-3-octene is treated first with Br2 in CH2Cl2, second with NaNH2 in NH3, and then finally with H2/Lindlar's catalyst.

  Balance and complete the following metallurgical reactions

Complete and balance the following metallurgical reactions. Phases are optional. I don't need them balanced, I can do that. I'm just not sure what's on the other side of the arrows. a. MoO3(s) + H2(g) --> b. Cu2S(s) + O2(g) -->

  What is the wavelength of radiation of frequency 480 times

what is the wavelength of radiation of frequency 4.80 times 1013

  Depict the lewis structure of the molecule

Draw the Lewis structure of the molecule, assuming that the Cl atoms bond to a single C atom and that there is a C-C bond and two C-O bonds in the compound.

  Define the largest solubility in the presence of anions

Given the Ksp values for the following precipitates, please predict which precipitate has the largest solubility in the presence of 0.01 M of its composing anions (e.g., in the presence of 0.01 M Cl- ion for AgCl(s)):

  Explain networks of tetrahedral with sio single bonds

Given that B(SiO) 640 kJ/mol, show that bond enthalpy considerations predict that silicon-oxygen compounds are likely to contain networks of tetrahedral with SiO single bonds

  Define what is the molarity of ethanol solution

A solution is found to be 4.33% Ethanol by mass CH3CH2OH. How many grams of ethanol are in 1 liter of this solution. What is the molarity of this solution

  Explain multistep synthesis of trans-stilbene

How can you outline a multistep synthesis of trans-stilbene (Ph-CH=CH-PH) using benzaldehyde

  Explain the light emitted by an incandescent light bulb

Create a 5-step procedure you think will work to compare the efficiency of the light emitted by an incandescent light bulb to a fluorescent light bulb.

  Evaluate the solubility of this compound in g/l

The Ksp of calcium carbonate, CaCO3, is 3.36 × 10-9. Calculate the solubility of this compound in g/L.

  Determine the relative amounts of each kind of bb

Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB. A bag contains a mixture of copper and lead BBs

  Explain where the radial nodes hydrogen wavefunctions sit

On a quantitatively labeled number line, draw where the radial nodes of the 1s, 2s, and 3s hydrogen wavefunctions sit.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd