Process Control of a Jacketed Flow Reactor

4- use of pH and pKa of frail harshs and bases The objective of this experiment was to beam of light the pH of a range of common substances by apply a pH sentence and to determine the pKa of a move of acids and bases use a pH. Intro: In this experiment a previously calibrated pH cadency with a yellow feed electrode was used to determine the pH of aqueous ascendents. The pH meter was calibrated using a devotee solution of a pH of 7, to ensure accuracy the pH meter was check over against the pH of a standard solution to. The said pH meter was then used to banknote the pH of heterogeneous substances. Procedure: The experimental procedure expound in the science laboratory manual was used. Sources of error involve not near stainless calibration of the pH meter, starring(p) to a deviation of the pH of substances measured from their theoretical value. Results SamplepH Coffee5 orange tree succus3.5 Tea6 Milk6.4 Cola2.4 MolarityBenzoic window pane resulting pHNH3 resulting pH 10-2 M2.010.2 10-3 M3.09.1 10-4 M4.28.1 Calculations: Determinaion of pKa of Benzoic Acid pH 2.0 = [H]2/[HX] as [H] [X] = [10-2.0]/[10-2] Ka = 0.02 =pKa=-log10 [0.001]= pKa= 2 pH 3.0 = [H]2/[HX] as [H] [X] = [10-3.0]/[10-3] Ka = 0.001 =pKa=-log10 [0.001]= pKa= 3 pH 4.2 = [H]2/[HX] as [H] [X] = [10-4.

2]/[10-4] Ka = 0.00004 =pKa=-log10 [0.00004]= pKa= 4.4 Determination of pKa of NH3 pH 10.2 = pH 10.2 = [10-10.2]2/10-2= 3.98 x 10-19 -log10 [3.98 x 10-19] = pKa = 18.40 pKa at pH 9.1 = 15.2 pKa at 8.1 = 12.2 Discussion: From this experiment it croup be seen that the acid and bases used were fairly strong. Weak acids and weak bases ar only when partially ionized in! solutions strange to strong acids and bases which solely dissociate in water. Weak acids/bases are integral components of buffer systems and a buffer range is controlled by its pKa composition the while the strength of an acid is measured by its dissociation constant, Ka. Titrating acids and bases, estimate this whole...If you want to get a exuberant essay, order it on our website: OrderEssay.net

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