Blah Composition

Acid-Base Titration Curves

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Learning Aims to understand the titration figure for this solutions • a fragile acid: lactic acid, CH3COOH. • • • • • a strong acid: hydrochloric acid, HCl. a great acidic business cleanser. a simple commercial facial cleanser. to use the titration figure to determine the percent of the active ingredients in the commercial cleaners. to determine the Ka of a poor acid. Procedure Overview • • • • after calibration in the pH electrode and willpower of the circulation rate pertaining to the automated titration, a NaOH remedy is standard against HCl. a pH titration contour for lactic acid is acquired and its pKa is determined. an unknown sample of Lysol is usually analyzed for its HCl content using the standardised NaOH. a mysterious sample of Liquid Plumr is examined for its NaOH and NaOCl content using HCl of known molarity.

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Brand ______________________________ Section _______

Day ____________________

ACID-BASE TITRATION FIGURE Report Sheet Determination of flow rate Equation pertaining to conversion by time to amount: Titration of HCl ph level at assent point volume of NaOH for equivalence level concentration of HCl volume of HCl Titration of lactic acid pH for equivalence stage volume of NaOH at assent point quantity at half-equivalence point ph level at half-equivalence point Titration of Lysol weight of beaker with Lysol fat of empty beaker mass of Lysol pH in equivalence stage volume of NaOH at equivalence point Titration of The liquid Plumr fat of beaker with Liquid Plumr weight of bare beaker mass of Liquefied Plumr pH at first equivalence point amount of HCl initially equivalence level pH by second equivalence point amount of HCl in second equivalence point

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Name ______________________________ Section _______

Date ____________________

ACID-BASE TITRATION CURVES Record Sheet Measurements 1 . Titration of HCl (Standardization of NaOH) a. Determine the moles of HCl.

b. Calculate the molarity of NaOH.

installment payments on your Titration of acetic acid a. Calculate the Ka to get acetic acid.

three or more. Titration of Lysol a. Calculate the percent HCl in Lysol.

4. Titration of Liquid Plumr a. Calculate the percent NaOH in Liquefied Plumr.

w. Calculate the percent NaOCl in Liquid Plumr.

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Name ______________________________ Section _______

Date ____________________

ACID-BASE TITRATION CURVES Questions/Problems 1 . Determine the pH of a option in which the attention of the hydronium ion means 2 . 0 x 10-4 M.

2 . If the ph level at the half-equivalence point for any titration of any weak chemical p with a good base can be 4. 62, determine the importance of the Ka for the weak acid solution.

3. If a 0. 5725 g test of Lysol was titrated with zero. 100 Meters NaOH, an endpoint was obtained by 15. 00 ml. Calculate the percent (by weight) of hydrochloric acid in the Lysol test.

4. When a 3. 529 g sample of The liquid Plumr was titrated with 0. 95 M HCl, two endpoints were acquired. The 1st endpoint happened at 12-15. 00 cubic centimeters, the second for 42. 00 ml. Calculate the percentages of both NaOH and NaOCl in Liquid Plumr.

five. If you do a " manual" titration, compare the graphically decided equivalence level and the sign determined end point. Should you did a " timed" titration, the indicator-determined end point MAY WELL have passed too quickly to get important data, but try to produce a comparison the best way you can.

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ACID-BASE TITRATION CURVES Recommended Answers to Questions/Problems 1 ) (A) Compute the ph level of a answer in which the focus of the hydronium ion equals 2 . 0 x 10-4 M. pH = sign[H3O+] = pH = several. 70 (b) If the ph level at the half-equivalence point for the titration of the weak acid solution with a good base is usually 4. sixty, determine the significance of the Ka for the weak acid. pKa = pH @ ВЅ equivalence point Ka = 15! 4. 60 = 2 . 5 back button 10! your five 2 . If a 0. 5725 g test of Lysol was titrated with 0. 100 Meters NaOH, a great endpoint was obtained by 15. 00 ml. Determine the percent (by weight) of hydrochloric acid in the Lysol sample. %HCl = (15...

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