What is the purpose of adding NaOH to the filtrate? To increase the pH of the fermenting solution (increase its basicity) To decrease the pH of the fermenting solution (increase its acidity) To maintain the optimal pH of the fermenting solution, which is 4.5 To remove impurities and by-products in the filtrate.

What is the purpose of adding NaOH to the filtrate? To increase the pH of the fermenting solution (increase its basicity) To decrease the pH of the fermenting solution (increase its acidity) To maintain the optimal pH of the fermenting solution, which is 4.5 To remove impurities and by-products in the filtrate.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter6: The Systematic Approach To Equilibria: Solving Many Equations

Section: Chapter Questions

Problem 12P

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A commercial vinegar was analyzed by titration to determine the percent acetic acid. Briefly, 10.00 mL of vinegar sample was diluted to 100. mL solution in a volumetric flask. A 25.00 mL aliquot from the diluted vinegar required 25.55 mL of 0.1005 M sodium hydroxide to reach the phenolphthalein endpoint From this experiment which is the standard solution used in titration? CH3COOH NaOH NaCH3COO C20H14O4
Part 1: Preparation of the Primary Citric Acid Standard Mass of Citric Acid: 4.05 g Volume of Citric Acid Solution: 7.5 (at the equivalence point) Moles of Citric Acid: 0211 mol (Molar Mass = 192.0 g/mol) Molarity of Citric Acid Solution: 0.2813 help me with part Part 2: Titration of the Sodium Hydroxide Solution Volume of Citric Acid at the Equivalence Point _____________ Moles of Citric Acid at the Equivalence Point _______________ Moles of NaOH at the Equivalence Point __________________ 3 NaOH + H3C6H5O7 à Na3C6H5O7 + 3 H2O Volume of NaOH _______________________________ 5. Calculated Molarity of NaOH _______________________
The fluids within cells are buffered by H2PO4– and HPO42–. Find the ratio of HPO42- to H2PO4- required to maintain a pH of 7.1 Ka(H2PO4-) = 6.2 x 10^-8
Some kidney stones form by the precipitation of calciumoxalate monohydrate (CaC₂O₄H₂O, Kₛₚ=2.3X10⁻⁹). The pH of urine varies from 5.5 to 7.0, and the average [Ca²⁺] in urine is 2.6X10⁻³ M.(a) If the [oxalic acid] in urine is 3.0X10⁻¹³ M, will kidneystones form at pH =5.5?(b) At pH= 7.0?(c) Vegetarians have a urine pH above 7. Are they more or lesslikely to form kidney stones?
A 20 mL sample of a 0.1 M KI and KCl mixture is titrated with 0.05 M AgNO3 in a common direct titration. Given that the literature Ksp values of AgI and AgCl in water are 8.5 x 10-17 and 1.77 x 10-10, respectively, which of the following statements are true? A. AgI is completely soluble in water. B. AgI will precipitate before AgCl. C. Both AgI and AgCl will precipitate at the same time. D. The [I-] and [Cl-] concentrations remain equal.
A 0.300-g feed sample is analyzed for its protein content by the modified Kjeldahl method. If 25.0 mL of 0.100 M HCl is required for titration, what is the percent protein content of the sample?
true or false 1.,Carbonic acid, as a contaminant in the assay of sodium bicarbonate, may render the end point to be yellow. 2,.To have a balanced equation in the assay of sodium bicarbonate, the titrant should have a coefficient of one and the sulfate salt of sodium produced should have a coefficient of three. 3.When a weak alkali is titrated with strong acid, the indicator used is methyl red.4 4.Sodium bicarbonate is considered as the primary standard in its own assay. 5.When a strong alkali is titrated with a strong acid, phenolphthalein may be used.
ANALYSIS OF VINEGAR A 25.00 mL vinegar sample was diluted to 250-mL using a volumetric flask. A 50.00 mL aliquot portion of the dilute vinegar solution needed 35.45 mL of 0.1200 M NaOH to reach the phenolphthalein end point. Calculate the number of mmoles of acetic acid present in the 50-mL aliquot portion that was titrated.
A 50.0 mL solution of Ca(OH)₂ with an unknown concentration was titrated with 0.340 M HNO₃. To reach the endpoint, a total of 28.4 mL of HNO₃ was required. Given that 0.00966 mol of HNO₃ are used in the titration, how many moles of Ca(OH)₂ had to be present in the initial reaction?
A team of geologists discovered a new basic salt, MgX2(OH)4, where X is a newly discovered metal. Given MgX2(OH4) <-> Mg2++2x2+4OH- Given that the molar solubility of this salt is 1.07×10-3 M, calculate Ksp. Show all of your work.
How much amount (in grams) do you need to prepare the following solutions 500.0 mL 0.1000 M stock EDTA solution from Na2H2EDTA•2H2O (FW=372.24) and MgCl2•6H2O crystals 100.0 mL 0.0500 M stock Ca2+ solution from pure CaCO3 (FW=100.09) and concentrated HCl 250 mL 1.0 M NH3-NH4+ pH 10 buffer solution from NH4Cl and NH3
A lab technologist needs to generate a 160mL phosphate buffer at 0.1M and pH6.8. The technologist has access to a solution of HPO42- at 0.2M and a solution of H2PO4- at 0.3M. The pKa where these forms of phosphate exist in equal measure is at pH7.2. What is the volume of HPO42- required to prepare 160mL of this 0.1M phosphate buffer at pH6.8?

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		To increase the pH of the fermenting solution (increase its basicity)
		To decrease the pH of the fermenting solution (increase its acidity)
		To maintain the optimal pH of the fermenting solution, which is 4.5
		To remove impurities and by-products in the filtrate.