Please don't use Ai solution prepare a graph of the absorbabce versus pH of the phenolphthalein at 550 nm in the pHrange 7 to 12. indicate the approximate point where the absorbance is half of the value at pH= 11.38

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Answered: prepare a graph of the absorbabce…

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

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Chapter7: Neutralization Titrations And Graphical Representations

Section: Chapter Questions

Problem 15P

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Write the values of Y and X. H2SO4 CH3CH=CH2 + H2O CH;CH-CH2 H HỌ 2-propanol an alcohol The pKa of a protonated alcohol is about -2.5, and the pKa of an alcohol is about 15. Therefore, as long as the pH of the solution is greater than Y and less than X, more than 50% of 2-propanol will be in its neutral, nonprotonated form. Express your answers using two significant figures separated by a comma. AX中 Y, X = %3|
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Benzoic acid(C6H5-COOH) is a weak acid(pKa=4.2) and naphthalene is neutral, neither acidic or basic. Prepare a flowchart for the separation and recovery of benzoic acid and naphthalene.
5. a) The Kw value that we normally use is for room temperature (25°C). Calculate the equilibrium H+ concentration and pH of pure, neutral water at 0.0°C (Kw= 1.14 x 10-15at 0.0°C) b) Methylamine (CH3NH2) is a derivative of the weak base ammonia. Write the equation for the ionization of methylamine in water, and use the I.C.E. method to find the pH of a 3.75 M CH3NH2 solution.(Kb= 4.37 x 10-4at 25°C)
Help with the following question. Please round the answer to 2 sig figs
Find the pH of a solution 2.0 M in ethylamine CH3CH2NH2. For CH3CH2NH2 Kb=5.6x10-4. Explain step by step as you set up the equation and what each element represents.
Calculate the percentages of dissociated and undissociated forms present in the following solutions: (a) 0.0010 M glycolic acid (HOCH2CO2H; pKa = 3.83) at pH = 4.50 (b) 0.0020 M propanoic acid (pKa = 4.87) at pH = 5.30
16-27 Guanidine, p/Ca 13.6, is a very strong base, almost as basic as hydroxide ion. NH NH2+ II II H2N—C—NH2 + H2O H2N—C—NH2 + OH" Guanidine Guanidinium ion pKb = 13.6 Complete the Lewis structure for guanidine, showing all valence electrons. The remarkable basicity of guanidine is attributed to the fact that the positive charge on the guanidinium ion is delocalized by resonance over the three nitrogen atoms. This delocalization increases the stability of the guanidinium ion relative to the ammonium ion or substituted ammonium ions. Draw three equivalent contributing structures for the guanidinium ion and show by the use of curved arrows how these three contributors are related. Propose an explanation for the fact that protonation occurs on the C=NH nitrogen rather than on one of the —NH., nitrogens. (Hint: Consider the resonance stabilization of the structure formed by protonation on a —NH., nitrogen compared with the resonance stabilization of the structure formed by protonation on the =NH nitrogen.) Predict the N—C—N bond angles in the hybrid. Which is the stronger acid, the ammonium ion or the guanidinium ion?
Using the literature value (from Kotz et al) for the Ka for HC3H5O2 (propanoic acid, also written as C2H5CO2H), calculate the theoretical Kb for the C3H5O2- propionate ion and the theoretical pH of a 0.173 M solution of sodium propionate. Using the literature Ka for theCH3NH3+ ion, calculate the theoretical pH of a 0.147 M solution of methylammonium chloride. What is the hydroxide ion concentration? A 0.119 M solution of Covidenol, a weak acid, has a measured pH of 3.45. Determine the pKa of Covidenol.
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prepare a graph of the absorbabce versus pH of the phenolphthalein at 550 nm in the pH range 7 to 12. indicate the approximate point where the absorbance is half of the value at pH = 11.38