Ionization Constants of Weak Acids lab.docx - Title:...

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Title:Ionization Constants of Weak AcidsNaOHIntroduction:An acid-base indicator is usually a weak acid with a characteristic color in the protonated anddeprotonated forms. Each acetic acid has its own pH and when you add an indicator that mightchange. We are going to be using a titration lab, this is a method of quantitative chemicalanalysis is to determine the concentration of an identified analyte. The titrant is also theconcentration. A buret is a glass tube with a tap at the end, this is for delivering known volumesof a liquid. This typically hold 50 mL of substance. You will see bottles of 0.1104 M NaOH and0.1031 M HAc (acetic acid) will be on the lab bench. The buret will be filled with the NaOHsolution and a beaker containing 10.00 mL of the HAc solution will be on the stir plate.An acid-base indicator is usually a weak acid with a characteristic color in the protonated anddeprotonated forms. Because bromocresol green is an acid, it is convenient to represent its rathercomplex formula as HBCG.Procedure:First select the Acid-Base chemistry, and then ionization constants of weak acids from the list.You will see a titration laboratory. Bottles of 0.1104 M NaOH and 0.1031 M HAc (acetic Acid)will be on the bench. The buret will be filled with the NaOH solution and a beaker containing10.00 mL of the HAc solution will be on the stir plate. You will see the stir plate on. TheBromocresol Green indicator will have been added to the beaker. You will also see a calibratedpH probe to monitor the solution.Write what the color and pH of the solution is.You will see the buret, the horizontal position of the orange handle is off for the stopcock. Openthe stopcock by pulling down on the orange handle. The vertical position delivers solution thefastest with three intermediate rates in between (slow drop-wise, fast drop-wise, and slowstream). Turn the stopcock to the second position or fast drop-wise addition. Observe the color of

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Term
Spring
Professor
N/A
Tags
pH, HAc, HBCG

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