Chromium(VI) is a widely used form of chromium that is also highly toxic (see the movie Erin Brockovich). Cr(VI) may be analyzed by reaction with 1,5-diphenylcarbazide (DPC). Cr(VI) oxidizes DPC forming diphenylcarbazone and Cr(III). Finally, a colored complex is formed between Cr(III) and diphenylcarbazone which absorbs light at 540 nm. 20.00 mL of a sample containing an unknown amount of Cr(VI) is reacted with DPC and the absorbance is determined to be 0.275. 40 μL of a 500 ppm Cr(VI) standard was added to a second 20.00 mL sample and the absorbance was determined to be 0.594. A solution containing no Cr(VI) is analyzed using the same procedure and gives a reading of 0.024. What is the concentration of Cr(VI) in the unknown sample?
Atomic Structure
The basic structure of an atom is defined as the component-level of atomic structure of an atom. Precisely speaking an atom consists of three major subatomic particles which are protons, neutrons, and electrons. Many theories have been stated for explaining the structure of an atom.
Shape of the D Orbital
Shapes of orbitals are an approximate representation of boundaries in space for finding electrons occupied in that respective orbital. D orbitals are known to have a clover leaf shape or dumbbell inside where electrons can be found.
Chromium(VI) is a widely used form of chromium that is also highly toxic (see the
movie Erin Brockovich). Cr(VI) may be analyzed by reaction with 1,5-diphenylcarbazide
(DPC). Cr(VI) oxidizes DPC forming diphenylcarbazone and Cr(III). Finally, a colored complex is
formed between Cr(III) and diphenylcarbazone which absorbs light at 540 nm.
20.00 mL of a sample containing an unknown amount of Cr(VI) is reacted with DPC and the
absorbance is determined to be 0.275. 40 μL of a 500 ppm Cr(VI) standard was added to a
second 20.00 mL sample and the absorbance was determined to be 0.594. A solution containing
no Cr(VI) is analyzed using the same procedure and gives a reading of 0.024.
What is the concentration of Cr(VI) in the unknown sample?
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