Which of the following are produced when an unknown sample is heated with concentrated sulfuric acid perchloric acid nitrogen dioxide hydrogen cyanide ammonium Which of the fol ving requires carbon tetrachloride as a reagent? * Bromide ion Chromate ion Thiosulfate ion Sulfite ion Which of the following reagents are used in the confirmatory test for arsenite ion? hydrochloric acid thioacetamide ammonium molybdate potassium manganate

Which of the following are produced when an unknown sample is heated with concentrated sulfuric acid perchloric acid nitrogen dioxide hydrogen cyanide ammonium Which of the fol ving requires carbon tetrachloride as a reagent? * Bromide ion Chromate ion Thiosulfate ion Sulfite ion Which of the following reagents are used in the confirmatory test for arsenite ion? hydrochloric acid thioacetamide ammonium molybdate potassium manganate

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.1QAP

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A mixture of sodium carbonate and sodium bicarbonate is dissolved in water and treated with 0.100 M HCl. At the phenolphthalein endpoint, 12.00 mL was used and 34.00 mL to reach the methyl orange endpoint. How many moles of sodium carbonate and sodium bicarbonate are in the sample?
[1a] Calculate for the concentration of the reagent grade acid.
Ethanol is needed as solvent when preparing phenolphthalein color indicator in volumetric titrations. What class of ethanol best suits the intended purpose? Explain your answer.
A sample may contain NaOH, NazCO3 and NaHCO3, alone or in some combination, along with inert material. A samplewitha mass of 857.6 mgwas dissolved and titrated with0.1163 M HCI. The volume of HCl used from 0 to methyl red endpoint (Phenolphthalein endpoint was not monitored here) was found to be 36.54 mL. Another 228.8 mg portion of the sample was titrated to the phenolphthalein endpoint and 10.82 mL was used up for this titration. a. What is the composition of the sample? b. Calculate the percentage of each of the component present.
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 mixture of sodium hydroxide and sodium carbonate B sodium bicarbonate only a mixture of sodium hydroxide and sodium bicarbonate sodium carbonate only
(b) AGNO3 test : Red precipitate formed , which dissolved in dilute HNO3 BaCl2 test : Yellow precipitate formed , which dissolved in dilute HCI Organic solvent test : The decane layer remained almost colorless after treatment with chlorine water Anion present_ (c) AGNO3 test : Yellow precipitate formed , which did not dissolved in dilute HNO3 BaCl, test : No precipitate formed Organic solvent test : The decane layer turned reddish-brown Anion present_
Which of the following is incorrect about direct titration? 1. OThe prepared solutions must be stable during titration 2. OStoichiometry of reaction between analyte and titrant should be known. 3. OReaction between titrant and analyte should be slow. 4. OReaction between titrant and analyte should be fast.
Titration of an oxalate sample gave the following percentages: 15.30 %, 15.59 % , and 15.57 % 1. Calculate the Average
Excess Cu(OH)2 is placed in a beaker and nitric acid is added to dissolve some of the copper oxide. Asa strong acid, nitric acid is fully dissociated. Write the relevant reactions for processes in the beaker. The complete dissociation of HNO3 is aRXN0, as shown. Two reactions RXN1 and RXN2 are needed to capture the chemistry in the beaker.RXN0: HNO3 + H2O -->H3O+ + NO3-
A chemist received different mixtures for analysis with the statement that they contained NAOH, NaHCO3, Na,CO3 or compatible mixtures of these substances together with inert material. From the data given, identify the respective materials. Sample 4. The sample was titrated with acid until the pink of phenolphthalein disappeared; this process required 39.96 mL. On adding an excess of the acid, boiling and titrating back with NAOH, it was found that the base was equivalent to the excess acid. O A NazCO3, NaHCO3 OB. NaHCO3 O C. Na2CO3 O D. None of these O E. NaOH
Which of the following could be added to a solution of sodium acetate to produce abuffer?A sodium chloride or potassium acetateB acetic acid or hydrochloric acidC acetic acid onlyD hydrochloric acid onlyE potassium acetate only
As a stabilizer for solutions of ascorbic acid for injection use: A) sodium bicarbonate B) hydrochloric acid C) Sodium sulfite anhydrous D) Sodium metabisulphite