Process Control of a Jacketed Flow Reactor

4- use of pH and pKa of sick harshs and bases The objective of this experiment was to jib the pH of a range of common substances by victimization 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 bill with a chicken feed electrode was used to determine the pH of aqueous upshots. The pH meter was calibrated using a devotee resolve 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 bank note the pH of heterogeneous substances. Procedure: The experimental procedure expound in the science laboratory manual was used. Sources of error allow in not near stainless calibration of the pH meter, conduct 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 lavatory be seen that the acid and base s used were fairly strong. Weak acids and we! ak bases are only when partially ionized in solutions unlike 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 ripe essay, order it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay