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Explain the general mechanism of electron ionization (analyte requirements, ion source, energy
levels, etc.)
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- Question 2. (A) Choose one ionisation technique from the ones discussed in the course (EI, CI, MALDI, ESI) and provide a detailed explanation of how it works, including diagrams if you like. Cover typical applications, and pros/cons, mass analysers that are typically used with this source etc.Why to use acid or base for the development of fluorescent carbon dots?Determine the net charge of the predominant form of Asp at (a) pH 1.0, (b) pH 3.0.
- explain why alumina containing zeolites possess chemically active surfaceA student is given an antacid tablet that weighed 5.6832g. The tablet was crushed and 4.3628g of the antacid was added to 200 mL of stimulated stomach acid. This was allowed to react and then filtered. It was found that 25 mL of this partially neutralized stomach acid required 8.50 mL of NAOH solution to titrations it to a methyl red endpoint. It took 21.54 mL of this NAOH solution to neutralize 25 mL of the original stomach acid. a)How much of the stomach acid had been neutralized in the 25 mL sample which was titrations? (Show work) B) how much stomach acid was neutralized by the 4.3628 g sample used? (Show work) C)How much stomach acid would have been neutralized by the original 5.6832 g tablet? (Show work)A student determines that the value of Ka for H2SO3 = 2.3×10-2 . What is the value of pKa?
- 5. Describe the principle on which each of the following GC detectors are based: (a) flame ionization, (b) electron capture,33a, no need to explain too much.(d) 0.15 M Ca(CIO3)2 lons: O CIO,- 2- CIO2- Ca2+ Ca+ O CIO3 [cation*] = M [anion] = M %3D Save for Later Attempts: 0 of 6 used Using multiple attempts will impact your score.
- Question 3. choose one mass analyser from the following – quadrupole, time of flight, ion trap, FT-ICR, orbitrap – and describe the principles of operation, pros and cons, typical applications etc. Provide as much detail as you can, including diagrams where appropriate.A general expression for Alpha values Consider a 1.64 M solution of Phtalic acid C6H4 (CO2H)2 abbreviated as H2A. Given: for C6H4 (CO2H)2 (Ka1 = 1.12 x 10-3 , Ka2 = 3.91 x 10-6 ) a) What are the species expected to be in the solution? b) Calculate the alpha values corresponding to each species at pH 6. c) Which species is predominant at pH 6, based on the alpha values? Was that predictable? d) Calculate the concentration of each species at pH=6.The Mohr's salt sample is diluted using a 0.5 M H,So,/ H;PO, solution. The function of the sulfuric acid is: Seleccione una. provide the protons for the reaction oxidize the ferrous ion reduce the chromic ion make the final point region more drastic change color when reaching the titration end point