O 8 https://online.vitalsource.com/reader/books/9781792484490/pageid/77 4. In a titration of KOH solution, 0.0742 g of KHP is weighed into a flask and dissolved in deionized water. The equivalence point of the titration is reached when 7.05 mL of KOH solution is added to the KHP solution. a) How many moles of KHP are in the solution? b) How many moles of KOH will have to be titrated to neutralize the KHP? c) What is the molarity of the KOH solution? (? 12:19 AM 民 to search Rain... 3/24/2022

O 8 https://online.vitalsource.com/reader/books/9781792484490/pageid/77 4. In a titration of KOH solution, 0.0742 g of KHP is weighed into a flask and dissolved in deionized water. The equivalence point of the titration is reached when 7.05 mL of KOH solution is added to the KHP solution. a) How many moles of KHP are in the solution? b) How many moles of KOH will have to be titrated to neutralize the KHP? c) What is the molarity of the KOH solution? (? 12:19 AM 民 to search Rain... 3/24/2022

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...

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A 0.5504-g sample of KHP (potassium hydrogen phthalate, KHC8H4O4; molar mass = 204.22 g/mol) is completely dissolved in enough deionized water to make 50.00 mL of solution. The titration of this solution with a KOH solution requires 20.50 mL of the base (KOH solution) to reach the “end-point”. What is the molar concentration of KOH solution? The reaction occurs as follows: KOH(aq) + KHC8H4O4(aq) --> K2C8H4O4(aq) + H2O(l) (A) 0.2457 M (B) 0.1315 M (C) 0.05390 M (D) 0.03823 M
The amount of protein in a sample of cheese was determined by a Kjeldahl analysis. After digesting a 0.9814-g sample of cheese, the nitrogen is oxidized to NH4+, converted to NH3 with NaOH, and distilled into a collection flask containing 50.00 mL of 0.1047 M HCI. The excess HCI is then back titrated with 0.1183 M NaOH, requiring 22.84 mL to reach the bromothymol blue end point. Report the %w/w protein in the cheese. Conversion factor from nitrogen to protein: General/meats: 6.25 Dairy: 6.38 Cereals: 5.70 Nuts and seeds: 5.30 I may be reproduced for classroom purposes
OCHEMICAL REACTIONS Determining the volume of base needed to titrate a given mass... chemistry student weighs out 0.0570 g of chloroacetic acid (HCH₂CICO2) into a 250. mL volumetric flask and dilutes to the mark with distilled water. He lans to titrate the acid with 0.2000M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Be sure your answer has the correct number of significant digits. mL Explanation Check AUG 2 0.0 X e S tv W 3/5 X MacBook Air Hu © 2023 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center A
Solid sodium carbonate is slowly added to 75.0 mL of a 0.0373 M cobalt(II) nitrate solution. The concentration of carbonate ion required to just initiate precipitation is M.
b) Water "softeners" work via the principle of ion-exchange. The tank of a water softener is filled with a soluble salt such as sodium chloride. As "hard" water passes through the tank, the undesirable ions in hard water (e.g., calcium, magnesium, and iron III) are exchanged for the more desirable "soft" (meaning more soluble) ions like sodium. Explain how swapping the "soft"-water sodium ions for "hard"-water ions would influence the behavior (the cleaning effectiveness) of soaps and detergents.
Jack determines the concentration of NaOH by titrating it with 4.0 g KHP (a monoprotic acid). It takes 21.2 mL of NaOH to reach the equivalence point. What is the concentration of the NaOH? molar mass of KHP 204.2 g/mol [NaOH] = [?] M [NaOH], M Enter
10- A solution with a volume of 100 ml is prepared by weighing 2.50 g from the mixture of Kl and KBr. When 10 ml of this solution is titrated with 0.015 M AgNO3 solution, there is a consumption of 105. Accordingly, calculate the percentage of Kl in the mixture A)88,4 B)43,7 C)56,3 D)11,6
A chemistry student needs to standardize a fresh solution of sodium hydroxide. He carefully weighs out 79. mg of oxalic acid (H,C,0,), a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in 250. mL of distilled water. The student then titrates the oxalic acid solution with his sodium hydroxide solution. When the titration reaches the equivalence point, the student finds he has used 23.0 mL of sodium hydroxide solution. Calculate the molarity of the student's sodium hydroxide solution. Be sure your answer has the correct number of significant digits.
Consider the titrimetric determination of acetic acid (60.05 g/mol) in vinegar. Titration of a 5.00 mL vinegar sample requires 16.15 mL of 0.250 M NaOH to reach the phenolphthalein end point. What is the percent weight by volume of acetic acid in the sample? 2.97 4.85 6.01 7.44 None of the choices
A 24.8mL sample of vegetable juice is titrated with 15.65mL of NaOH solution. The molar concentration of the NaOH is .106 M. The molar mass of citric acid is 192.12 g-mol-1. Express all with three significant figures. A) Determine the molar concentration of citric acid in the vegetable juice sample B) Determine the number of moles of citric acid per 240 mL of the vegetable juice. C) Determine the mass of citric acid per 240 mL of the vegetable juice. D) If the label on the bottle lists the citric acid contest as 1g per serving with a serving size of 240 mL determine the percent error in the rotation results. Express in 2 sig figs.
Solid potassium sulfite is slowly added to 75.0 mL of a 0.0373 M barium nitrate solution. The concentration of sulfite ion required to just initiate precipitation is M.
A 25.00 mL aliquot is withdrawn from the liquid portion of saturated Manganese (II) hydroxide and transferred to an Erlenmeyer flask. After the addition of methyl orange, a titration with 0.0045 M HCl was performed. The endpoint was reached after 8.72 mL of the acid was added. What is the balanced chemical equation? How many moles of hydroxide ions were neutralized in the reaction? What is the molar concentration of hydroxide in the saturated solution? What is the molar concentration of Magnesium ion in solution?