Interpretation:
To explain the reason for the broader spectrum of CaOH compared to the sodium emission line.
Concept introduction:
Spectral lines help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrow frequency range nearby.
Answer to Problem 8.1QAP
CaOH spectrum is broader owing to the transitions among the vibrational and rotational states whereas in the case of sodium, the transitions take place among electronic energy states.
Explanation of Solution
CaOH or calcium hydroxide is an ionic molecule where vibrational and rotational levels are possible. Owing to the transitions among the vibrational, rotational states, there exists broad line spectra in case of the CaOH molecule.
In the case of sodium, it is not possible to have the transitions among the vibrational, rotational states. They take place among electronic energy states thus, resulting in a line spectrum.
CaOH spectrum is broader owing to the transitions among the vibrational and rotational states which is not possible in sodium.
Want to see more full solutions like this?
Chapter 8 Solutions
Principles of Instrumental Analysis
- Quality assurance. Tin can be leached (dissolved) into canned foods from the tin-plated steel can. (a) For analysis by inductively coupled plasma–atomic emission, food is digested by microwave heating in a Teflon bomb (Figure 2-18) in three steps with HNO3, H2O2, and HCl. CsCl is added to the final solution at a concentration of 1 g/L. What is the purpose of the CsCl?arrow_forwardFluorescence occurs within (a) none of the above (b) 10-5 s (c) 10-5 ms (d) 10-5 nsarrow_forwardHow many different values of m1 are possible in 4f sub-level?arrow_forward
- Calaculate the initial concentration of [Fe3+] and [SCN-] of a solution with 5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN, 3 mL of water, and an absorbance of 0.221.arrow_forwardHow do I find Concentration? flask Calculate solution Concentration (M) Volume stock of 0.40 M CuSO4 (ml) Volume of flask (ml) Absorbance at 635 nm(a.u.) 1 2.0 10 .185 2 4.0 10 .362 3 6.0 10 .510 4 8.0 10 .674 5 10.0 10 .843arrow_forwardThe absorption coefficient of O2 in seawater at 0°C is 1.7 mmol/L.What is the concentration of O2 if the O2 partial pressure is 0.1atm? Express your answer first in mmol/L, then in mL/L.arrow_forward
- The absorbance values at 250nm of 5 standard solutions, and sample solution of a drug are given below: Conc. (ug/ml) A 250 nm10 0.16820. 0.32930 0.50840. 0.66050 0.846Sample. 0.661Calculate the concentration of the samplearrow_forwardA 10 μL aqueous sample containing 1 attogram of Rb+ was injected into a graphite furnace atomic absorption instrument. Calculate the concentration of Rb+ atoms in ppb. The molecular weight of Rb is 85.47 g/mol. density of water = 1.0 g/mL atto = 1 x 10-18 Amazingly, the low concentration of this sample can be detectedarrow_forwardThe observed intensity of light (I) after passing through the sample cell is one-fourth the initial intensity (I0) from the light source. The absorbance (A) of the sample solution is a)0.097 b)0.602 c)25.0 d)0.250 e)1.398arrow_forward
- If the absorbance of 0.291 M copper (II) chloride solution is 0.497 and the path length of light is 1.00 cm, what is the Beers Law extinction coefficient?arrow_forwardGiven the fact that O2, N2, and O in the upper atmosphere absorb most of the light with wavelengths shorter than 240 nm, would you expect thephotodissociation of C ¬ F bonds to be significant in the lower atmosphere?arrow_forwardYou did not allow enough time for the solution to reach equilibrium before measuring its absorbance. Explain how this will affect the reported value of Kc.arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage LearningMacroscale and Microscale Organic ExperimentsChemistryISBN:9781305577190Author:Kenneth L. Williamson, Katherine M. MastersPublisher:Brooks ColeChemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning