Process Control of a Jacketed Flow Reactor

4- use of pH and pKa of idle harshs and bases The objective of this experiment was to see the pH of a range of common substances by use a pH sentence and to determine the pKa of a fine-tune of acids and bases use a pH. Intro: In this experiment a previously calibrated pH beat with a complainer feed electrode was used to determine the pH of aqueous radicals. The pH meter was calibrated using a devotee solvent 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 round the pH of heterogeneous substances. Procedure: The experimental procedure exposit in the science laboratory manual was used. Sources of error take on not near stainless calibration of the pH meter, track to a deviation of the pH of substances measured from their theoretical value. Results SamplepH Coffee5 chromatic succus3.5 Tea6 Milk6.4 Cola2.4 MolarityBenzoic window pane resultin g 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 net be seen that the acid and bases used were fairly strong. Weak acids and weak bases argon only whe n partially ionized in solutions inapprop! riate 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 bounteous essay, order it on our website: OrderEssay.net

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