In a two-vessel technique titration set-up, what is the unknown substance if the volume of phenolphthalein endpoint is greater than half of the volume of bromocresol green endpoint? sodium carbonate only sodium bicarbonate only a mixture of sodium hydroxide and sodium carbonate a mixture of sodium hydroxide and

In a two-vessel technique titration set-up, what is the unknown substance if the volume of phenolphthalein endpoint is greater than half of the volume of bromocresol green endpoint? sodium carbonate only sodium bicarbonate only a mixture of sodium hydroxide and sodium carbonate a mixture of sodium hydroxide and

Introductory Chemistry: An Active Learning Approach

6th Edition

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Mark S. Cracolice, Ed Peters

Chapter16: Solutions

Section: Chapter Questions

Problem 64E

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In a two-vessel technique titration set-up, what is the unknown substance if the volume of phenolphthalein endpoint is greater than half of the volume of bromocresol green endpoint? A.a mixture of sodium hydroxide and sodium carbonate B.a mixture of sodium hydroxide and sodium carbonate C. a mixture of sodium hydroxide and sodium bicarbonate D. sodium carbonate only
Phenolphthalein turns pink when the pH is less than 7. True or false
1. Which of the following is the best primary standard for the standardization of NaOH?a. KHPb. Glacial Acetic Acidc. Ascorbic Acidd. HCl acid solution 2. Which of the following is the best primary standard for the standardization of HCl?a. Na2CO3b. NaOHc. NaHCO3d. KHP
Which of the following is not standardized against sodium carbonate? a) H2SO4 b) NaOH c) HCl Which of the following is not standardized against KHP? a) H2SO4 b) NaOH c) HCl
Now that you have learned about solubility, explain why aspirin (Section 2.7) crosses a cell membrane as a neutral carboxylic acid rather than an ionic conjugate base.
Because phenol (C6H5OH) is less acidic than a carboxylic acid, it can be deprotonated by NaOH but not by the weaker base NaHCO3. Using this information, write out an extraction sequence that can be used to separate C6H5OH, benzoic acid, and cyclohexanol. Show what compound is present in each layer at each stage of the process, and if it is present in its neutral or ionic form.
The red color in the nirtate broth following the addition of reagent A and reagent B, but before the addition of zinc indicates the presence of : A.) Ammonium (NH4+) B.) Nitrate (NO3-) C.) Nitrogen gas (N2) D.) Nitrite (NO2-)
1. Explain the differences in melting point of these test compounds by relating with their structures and intermolecular or intramolecular forces of attraction: a. benzoic acid and salicylic acid b. p-aminobenzoic acid and salicylic acid c. oxalic acid and succinic acid d. succinic acid and malic acid Please provide link for citation.
Explain why the mixture is buffered at pH 6 to 9?
How do the reactions of phenol samples with FeCl3compare? Which structural component of the phenols account for the observation? 2. What compound is the precipitate formed in the Bromine water test? 3. Write the reaction formed in the formation of phenolphthalein. Identify the functional group in phenolphthalein, which is responsible for the indicator property. 4. What is the significance of Millon's test?
In a titration of methylamine CH3NH2 (pKb = 3.34) with HNO3, which of the following color indicator is preferred? You may refer to the lecture slides to find their transition range. Erythrosin B Alizarin m-Nitrophenol Bromthymol blue Phenol Red
What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & III