Discuss and explain the differences that you observe when calibrating with both techniques (AAS and ICP-AES).

what steps taken after excision of the bands before analyzing by mass spectrometry?

3. Identify and label chlorophyll a and chlorophyll b on the 1:2 plate. Explain the basis for your assignment with reference to the colour and the chemical structures of the two pigments.

Am i doing right on this?? Or wrong? (Determining conc of unknown using calibration curve)

6 why it makes sense to use an internal standard in IR spectrometry when its not used in Uv-Vis

The mass spectrum of 2,2-dimethylpropane shows only a very weak molecular ion peak at m/z = 72. However, a large peak at mlz = 57 is seen. Suggest a possible structure of the fragment giving rise to this large peak and suggest a reason as to why this peak is so large. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). T U Paragraph 5

Discuss the advantages of NMR spectroscopy over infrared and UV-Vis spectroscopy and other classical methods such as those used to measure peroxide values, conjugated dienes and trienes, para-anisidine value, and thiobarbituric acid-reactive substances for monitoring chemical changes in reaction mixtures.

Topic: Transmittance and absorbance, lambert-beer law Formaldehyde can be determined in UV spectroscopy. For this, the sawdust sample is brought to dryness and 200 are weighed grams of the dry sample, carrying out the extraction of formaldehyde with a soxhlet equipment. The volume of extraction solution used is 1 liter. The absorbance reading for this solution is 0.467. In a standard 10 ppm formaldehyde solution concentration, separately gave us a transmittance reading of 55.1%, in the same cell at the same wavelength. What amount of formaldehyde in mg is present for each kilogram of dry wood chips?

The concentration of hydronium ions and hydroxide ions can vary widely in a solution, easily from 1 M to 1 x 10-14 M. This variation is too wide to fit on an analog readout. In order to make this into a smaller scale suitable for an analog readout, the log to the base 10 was used so that the read out is focused on powers of 10. Note that the log [1] = 0, and the log of 1 x 10-14 = -14. It was then decided that the numbers should be positive so the sign was changed. The way to measure concentrations of both H+ and OH- was thus defined as -log. This was then referred to as p. Thus, pH = -log[H+], pOH = -log[OH-], and pK = -log[Keq]. You need to figure out how to do this mathematical manipulation on your calculator. The acid-base reaction in pure water is H2O + H2O ⇔ H3O+1 + OH-1 and it was found that in pure water under standard conditions the [H3O+1] = [OH-1] = 1 x 10-7 M Neutral pH is defined as having a [H+] or [H3O+1] of 1 x 10-7 M. The pH of a neutral solution is thus pH = -log[1 x…

Determine [FeSCN²+] of the unknown in Part B using measured absorbance and the trendline of calibration curve. absorbance(x) is 0.606 trendline is y=5790.0000x+(-0.0180); R2: 0.9978