A 2.25 g sample of butter was refluxed with ethanolic KOH and required 18.6 mL of 0.1978 M HCl to reach the phenolphthalein endpoint. If the blank determination 47.1 mL of the same standard acid, a. Calculate the saponification value of the sample b. Assuming that the sample comprised mainly of fat, what is its molar mass?

A 2.25 g sample of butter was refluxed with ethanolic KOH and required 18.6 mL of 0.1978 M HCl to reach the phenolphthalein endpoint. If the blank determination 47.1 mL of the same standard acid, a. Calculate the saponification value of the sample b. Assuming that the sample comprised mainly of fat, what is its molar mass?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Q.26.
Given that the equivalence point volume from the second derivative plot is 7.3429, how many grams of salicylic acid (138.121 g/mol) was synthesized? To determine the yield of the hydrolysis reaction, potentiometric titration was done. NaOH was used as the titrant, and three trials of standardization with KHP yields a titrant concentration of 0.0427 M.
39. Three more samples of KHP (GFW=204.23g/mole) weighing 0.8001g, 0.7001, and 0.7666g were titrated with the same sodium hydroxide solution. The volumes for the titrations were 21.55mL, 17.44, and 18.37mL respectively. A.) Calculate three more values for the molarity =, then B.) Calculate the mean for all four measurements. And calculate the average for all for measureme ement ave. mean.
I have seen other "experts" answer this question but i'm not understanding the process. Please write out the steps and why. And please explain why we use 0.100-x and x.
I did an experiment called Potentiometric Analyses where we titrate NaOH with a solid unknown weak acid. Our group was told that our weak acid is diprotic. Mass of dry, solid acid = .155g Molar concentration of NaOH (mol/L)= 0.100 Buret reading of NaOH, initial (mL)= 50 mL Buret reading NaOH at stocichiometric point, final (mL)= 22.1 mL Volume of NaOH dispensed (mL) 27.9 mL Moles of NaOH to stoichiometric point (mol) : _____________ (I think the above answer would be 2.79 x 10-2? if yes then skip) Moles of acid (mol) _____________ Molar mass of acid (g/mol) __________ Note: In the book it says for a diprotic acid, 2 mol of OH-, neutralizes one mole of acid.
What is the mole ratio of sodium acetate to acetic acid in abuffer with a pH of 5.75?
Given: Concentration, Volume, Temperature (20C) Calculated: Molarity, Concentration of OH- and Ca2+ What is the information needed to know if Ksp will increase or decrease with temperature? What is the effect on Ksp when temperature is increased?
Could someone help me answer these questions? I am unsure on how to go about this.
In a test tube with 0.3 mL of Aniline, 5 mL of 10% NaOH, 0.4 mL of benzene sulfonyl chloride. Add a few drops of 4M KOH to make sure it is alkaline and use a litmus paper. Let it stand for 10 minutes. Pour 6M HCl dropwise until it acidify. Explain what happens to the mixture before and after adding HCl. If a precipitate is formed, collect it by filtration or decantation. Test for solubility of the precipitate in 3 mL of 2.5M NaOH. Heat to 50 OC. Shake the tube well for 3 minutes. Explain what happens to the mixture after adding NAOH. Before adding HCl After adding HCl After adding NaOH
Given NaOH pellet and water, write down the procedure to make a concentration gradient of 0, 0.1, 0.2, 0.4, 0.8, 1.6 mM (1mL each).
4. Diprotic acid system. a. Plot the ionization fractions (do, ɑi, a2) as a function of pH (0-14) for the diprotic system malic acid (C4H6O5), which is found in fruits such as apples. pKa1 = 3.40, pKa2 = 5.20 b. At a typical pH for natural waters, which species in the malic acid system dominates?
Draw the titration curve for serine and glutamic acid, starting at pH1, going to 14 andadding equivalents of base