9. The structure of hippuric acid is shown below. Draw the expected parent ion if ESI was used in (a) positive ion mode and (b) negative ion mode. Hence indicate the m/z value of each of the molecular ion that you have drawn. HN O Structure of hippuric acid. OH
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- Set up an ice table, find the Kb expression and find the initial concentration for C6H5NH3+In spectrophotometry, there is a linear relationship between the extinction coefficient and the concentration of the sample. a linear relationship between the absorbance and the concentration of the sample. a logarithmic relationship between the absorbance and the concentration of the sample. an inverse relationship between the absorbance and the concentration of the sample. Which is NOT TRUE about performing a BLANK titration? Choose the best answer. It involves titration of a solution that is without the analyte. It involves titration of unreacted standard solution which has been added in excess to a sample. It involves a titration done in the absence of an analyte to correct for possible sources of error. It involves titration carried out on a solution different from the sample solution.Which qualitative test for the identification of an anion was most interesting? Briefly justify your answer
- Which of the following is incorrect: General steps in qualitative analysis include: Method selection, sampling, sample processing, calibration & measurement. b. Quantitative analytical methods include: gravimetric, volumetric, spectroscopic and electroanalytical methods. c. The first step in sample processing is sample preparation. d. Replication improves the quality of results and their reliability. e. In quantitative analysis there should be a direct proportionality between a measured property and the concentration or amount of substance. Please fill in the spa ces one of the following characters (a or b or e or d or e)The kinetics of hydrolysis of acetylsalicylic acid (aspirin) under certain conditions of temperature, pH, type of buffer and strength ionic, can be followed by multicomponent spectrophotometry. When performing a calculation of optical constants, the following data were obtained: Solution C. mg/100 mL A in λ (276nm) A in λ (290nm) Ac. acetylsalicylic ( AAS) 0.202 0.102 0.031 Ac. salicylic (AS) 0.198 0.158 0.101 Reaction: AAS + H2O → AS + CH3COOH In a kinetic study, after a certain time, 1 mL of the solution was taken from the reactor and diluted to 10 mL with water. distilled. Then when proceeding to the spectrophotometric measurement, the last solution presented the absorbances of 0.244 and 0.102 for the lengths of 276 and 290 nm respectively. What are the concentrations of ASA and AS in mg/L, at that instant in the reactor? Note: Acetic acid does not absorb at either wavelength.We are stuck on 9. We get how Q is 16 and rxn goes left. at eq 2+ x. 2 + x. -2 x We get x= 1. Therefore k = 4. Please help us. Questin 9. See conditions from 8 This is not a graded question as it is a practice question . I am 60 years old and helping my son prepare for the AP exam in a few months. We do questions at the back of the textbook by Zumdahl and Zumdahl
- 13. The figure below shows three acids HX, HY and HZ, (water molecules are omitted for clarity). Which acid has the largest pKa? %3D НА 3 Н,о* НХ HY HZ А. НХ B. HY C. HZ D. it depends on the amount of acid present.A student determines that the value of Ka for H2SO3 = 2.3×10-2 . What is the value of pKa?Please how I find the q Fe,q water, q cal with the ungrounded and rounded values please.
- 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…all i need is help with question 4 a !!The surface of the silica gel has a structure that looks like this diagram below. Suppose you used a plate coated with silica gel, with propanone, CH3COCH3, as the solvent for thin-layer chromatography. Suppose also that the mixture you were trying to identify contained benzaldehyde benzanilide phenol 1) rank the Rf value from large to small 2) name the IMF between each compound and the silica gel OH OH OH -0-Si-O-Si-O-Si-O- O main body of silica structure
