Preparation of cpper(1) chloride What color observed for the solution of Na2SO3 in water? What colour observed for solutions of CuCl2.2H2O in water? Which ion is responsible for the colour that is observed in the CuCl2 solution? What is observed when th Na2SO3 solution is added to the CuCl2? Which gas can be smelled when H2SO4 is added to the mixture? What is the colour of the CuCl when it is filtered on Buchner funnel? (before it is exposed to the atmosphere)

Preparation of cpper(1) chloride What color observed for the solution of Na2SO3 in water? What colour observed for solutions of CuCl2.2H2O in water? Which ion is responsible for the colour that is observed in the CuCl2 solution? What is observed when th Na2SO3 solution is added to the CuCl2? Which gas can be smelled when H2SO4 is added to the mixture? What is the colour of the CuCl when it is filtered on Buchner funnel? (before it is exposed to the atmosphere)

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 14.3QAP: Sketch a photometric titration curve for the titration of Sn2+ with MnO4 . What color radiation...

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Finely ground mineral (0.9315 g) was dissolved in 25 mL of boiling 4 M HCl and diluted with 175 mL H2O containing two drops of methyl red indicator. The solution was heated to 100C, and 50 mL of warm solution containing 2.0 g (NH4)2C2O4 were slowly added to precipitate CaC2O4. Then 6 M NH3 was added until the indicator changed from red to yellow, showing that the liquid was neutral or slightly basic. After slow cooling for 1 h, the liquid was decanted and the solid transferred to a filter crucible and washed with cold 0.1 wt% (NH4)2C2O4 solution five times until no Cl- was detected in the filtrate upon addition of AgNO3 solution. The crucible was dried at 105C for 1 h and then at 500 ± 25 C in a furnace for 2 h. Ca2+ + C2O42- --> CaC2O4.H2O(s) -->500C CaCO3(s) The mass of the empty crucible was 16.9743 g, and the mass of the crucible with CaCO3(s) was 17.198164 g. Find the wt% Ca in the mineral. a) Why is the unknown solution heated to boiling and the precipitant solution,…
A pure dilute solution of sodium in liquid ammonia shows which colour?
250.0 ml of the mineral water sample was precipitated with potassium sodium tetraphenyl bromate: K+ + B(C6H5)4-  KB(C6H5)(s). The precipitate was filtered, washed and dissolved in an organic solvent. An excess of HgY2- was added to the solution: 4 HgY2- + B(C6H5)4- +4H2O  H3BO3 + 4C6H5Hg+ + 4HY3- + OH-. The liberated EDTA was titrated with 0.05581 M Mg 2+ solution, which consumed 29.64 mL. Calculate the potassium concentration [mg/l] in the sample.
What weight of strontium acetate containing 99% Sr(CH3COOH)2.½H2O must be used as sample in an assay according to the general method for alkali salts of organic acids if, after treatment of the ash with 50.00 ml of 0.5162 N hydrochloric acid, it is desirable to consume 30.00 ml of 0.4675 N sodium hydroxide in the back titration?
a.) What are the primary standard substances used in the adjustment of thiosulfate solutions?b.) When should starch indicator be added in iodometric titration? Explain why.c.) Since 31.4 mL of 0.10 N Na2S2O3 solution is consumed in the iodometric determination of copper at a weight of 2,000 g taken from a copper-containing material, find the percentage of copper in the sample (Cu: 63.5 gmol-1).
True or False 1. When indophenol is formed, the complex emits colour. 2. In the reaction of phenol with Bromine TS, a white precipitate of a mixture of ortho-bromophenol and para-bromophenol are formed 3. In the esterification process of ethanol with acetic an hydride, the reaction will proceed with NaOH or any strong base as catalyst. 4. Oxidation of methanol using chromic acid leads to the formation of formic acid as the final product 5. Ferric chloride is used to detect the presence of benzene ring in aromatic groups, thus when benzyl alcohol is subjected to this reagent, a positive result is expected.
A mixture containing only KCl and NaBr is analyzed by the Mohr method. A 0.2125-g sample is dissolved in 25 mL of water and titrated to the Ag2CrO4 endpoint, requiring 25.63 mL of 0.1110 M AgNO3. A blank titration requires 1.15 mL of titrant to reach the same end point. Report the %w/w KCl and NaBr in the sample. KCl = 74.551 NaBr = 102.89
Explain why colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.
Caustic potash that has been exposed to air is found on analysis to contain 90.00% KOH, 2.38% K2CO3 and 7.62% H2O. What weight of residue will be obtained if 1.00 g of this sample is added to 46.00 mL of 1.00 N HCl and the resulting solution, after neutralization with 1.070N KOH is evaporated to dryness?
bottle of Na2EDTA.2H2O is labeled with an assay of 100.5%, what is this implied? What is the result of heating to 100 ºC? How does the Eriochrome Black T indicator function?
An unknown salt X reacts with hot conc. H2SO4 to produce a brown coloured gas which intensifies on addition on copper turnings. On adding dilute ferrous sulphate solution to an aqueous solution of X and then carefully adding conc. H2SO4along the sides of the test tube, a brown complex Y is formed at the interface between the solution and H2SO4. Identify X andY and write the chemical equation involved in the reaction.
2. A sample of material contains for its active components NaOH, NazCO3, NaHCO3, or compatible mixtures of these. Two samples, each weighing 1.000 g, are dissolved in H20. To one sample phenolphthalein is added and the solution is titrated cold with 1.038 N acid, of which 17.96 mL is required. The other sample is titrated cold, with methyl orange as indicator, and 21.17 mL of the same acid is required. What alkalis are present, and what is the percentage of each in the original sample?