Given the volume of 0.1416 M NaOH used determine the concentration of 16 ml sample each from aquaeous layer (Aq) and benzene layer (Or). To reach the end point of Aquqeous layer and organic layer 13.16 ml and 14.00 ml of NaOH used respectively using Phenolppthalein indicator. What will be the Kd of the system?

Given the volume of 0.1416 M NaOH used determine the concentration of 16 ml sample each from aquaeous layer (Aq) and benzene layer (Or). To reach the end point of Aquqeous layer and organic layer 13.16 ml and 14.00 ml of NaOH used respectively using Phenolppthalein indicator. What will be the Kd of the system?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter16: Reactions Between Acids And Bases

Section: Chapter Questions

Problem 16.54QE

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In the experiment conducted to determine the amount of acetic acid in vinegar, 8.2 mL of NaOH standard solution adjusted to 0.098 M was spent besides the phenolphthaleley indicator. Accordingly, which of the following is the amount of acetic acid in the vinegar sample in grams? (Ma (CH3COOH): 60.05 g/mol) A. 0.048 B. 0.024 C. 0.096 D.0.072
Why does the color change of an indicator take place over arange of about 2 pH units?
A 1.2 g sample of mixture of NaOH and Na:COs containing inert impurities s dissolved and titrated cold with 0.5N HCI. With phenolphthalein as indicator the solution turns colorless after the addition of 30.0 mL of the acid. Methyl orange is then added and 12 ml more of the acid is required before this indicator changes color. What is the percentage of NaOH and of Na:COs in the sample ?
Solution A: 1.7 x 10-5 M HCI Solution B: 3.40 8 of CH3C0ONa.3H20 in 250 mL of 0.1 M CH3COOH (Buffer solution) 0.IM NaOH and methyl red indicator pH solution steps obseration Solution A Addition of a few drops the colour changes from clear to pink 4.68 of methylred (HCL) Addition of 10 drops of The colour change from clear to pink 4.73 0.1 M NAOH Soluion B Addition of a few drops The colour change from pink to clear of methyl red (buffer solution) Addition of 10 drops of The colour stays the same 4.73 0.1 M NaOH a) Calculate the pH of a buffer system made up of 0.25 M C6H5C0OH and 0.35 M C6H5COONa. b)What is the pH after the addition of 20 mL of 0.I M HCI to 500 ml of the above buffer solution? c)Describe how you would prepare a IL solution of 0.1 M sodium acetate (CH3CO0Na)/0.I M acetic acid (CH3C0OH) buffer system with a pH of about 5.
a). What are acids, bases and buffers?b) What are the different types of buffers? Describe the mechanism howbuffers resist pH change in a system.c) Elaborate all chemical reactions in the standardization of NaOH withKHP?d) Why do you need to use KHP in the standardization of NaOH?e) Why is phenolphthalein used as an indicator in this experiment?f) Compare and contrast: endpoint vs equivalence point.g) Discuss the role of acids, bases, buffers and pH in water qualitymonitoring and post-harvest fisheries.
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*which of the following are correct of the Procedural Steps: toit □ The PH meter be calibrated before use. 109, 9/ Used solutions, □ A 25.0 ml Sample of vinegar is diluted to 250ml □ Solutions of Known PH; called buffer are to calibrate the pH meter. □PH and volume measurements are collected approximately every 0.2 change in PH. of (spropst pak Ord noi tulo? Not od to smolou thy09 344 7) NO 1917, no 11 SHE 20 ENOT STEF bit OUSIN p 401 gonsloviope pr 5 10 triot Song Lovrops holo) 69 sub of bonp⁹7 2999912 70 70/4 TO
Titration Titrant Primary Standard I. Complete the table Write your answers in the answer booklet provided. Color change/end point Indicator detection Acid-Base (1) KHP Phenolphthalein (8) HCI (3) Phenolphthalein (9) Redox Complexometric KMnO4 EDTA (4) (5) (10) CaCO3 (6) (11) Precipitation (2) NaCl (7) Formation of brick red ppt (Mohr Method) Na2CO3 starch Fill in the table above with the choices from the answer bank that follows. You can select one choice more than once or not at all. If the answer is not found below, write "none". KSCN Fe3+ yellow to orange AgNO3 NaOH yellow green to pink K₂CrO4 Red to yellow pink to colorless KMnO4 formation of red complex deep blue to colorless colorless to pink/red AS2O3 KSCN EBT purple to colorless colorless to purple red to blue Na2C2O4 Cu Acid-Base Fluorescein Argentometric colorless to deep blue Volhard
titration curve in acid-base titration is all acid-base indicator are suitable for use .a O weak acid can be used for titrating weak bases .b o less steep curve for strong analyte versus strong titrant than weak ones .CO the end point does not necessary match pH=7 for all types of acid and base analytes .d O
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M of NaOH: 0.100 Volume of HCI 25mL = 0.025L Moles of HCI = 2.5 mol What is the Volume of NaOH equivalence point: What is Moles of NaOH equaivalence point: What is pH at equivalence point? What is calculated pH and experimental pH of NaOH at 0.00 mL , 12.50 mL, 25mL, and 30 mL. Also what is the Error percentage for each one?