A flame test of a colorless solution gives a bright yellow color. When reacted with AgNO3 a white precipitate forms that dissolves when HNO3 is added. When HCl is added to the inknown solution, bubbles form. What is the compound in the colorless solution?
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A flame test of a colorless solution gives a bright yellow color. When reacted with AgNO3 a white precipitate forms that dissolves when HNO3 is added. When HCl is added to the inknown solution, bubbles form. What is the compound in the colorless solution?
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- What is the purpose of adding concentrated ammonia in the elimination test for cations? Select one: a. because NH3 is a stronger base than NaOH b. to provide a strongly basic solution c. to determine if the hydroxide precipitates are amphoteric d. to determine if the test ions form NH3 complexes e. to determine if the NH3 solution oxidizes the test ionsUpon the test of Cadmium ion, a black precipitate was obtained rather than a yellow precipitate. What may have caused the blackening of the precipitate?You are planning to determine the concentration of acid in vinegar by titration with a suitable base. The container of vinegar states that the acetic acid concentration in the vinegar is 10%.Suggest a suitable titration to carry out this determination (note all reagents) and estimate the amount of 0.01 mol/l alkali solution that you will require for your class group (assuming 3 titrations by 10 students). Indicate the alkali solution that you will use.
- 6.30 g sample containing tellerium is dissolved and 47 mL of 0.03 M K2Cr2O7 is added. After the reaction is complete, excess Cr2O72- is back-titrated with 11 mL of 0.105 M Fe2+. Find the percent by mass of TeO2 in the sample.one of the following is correct about Fajans method a. adsorption of Fluorescence on precipitate transfer the color from the precipitate to the solution b. the primary layer of precipitate before reaching the end point has a negative charge c. none of them d. Fluorescence is a basic dye ionized during the titrationWhich are false? - purple solution of KMnO4 in burette may be cleaned using oxalate or peroxide - the burette should be washed with the titrant first before titration - HCl cannot be used in place of H2SO4 - MnO2 solids which may form during storage can be filtered out using a filter paper - KMnO4 solutions should be stored in an amber colored bottle protected by light to prevent oxidation - All are false - All are true
- 1. A similar experiment as this lab is done as following: 0.456 g of solid AgCl is added a 25 mL solution of a 1.05 M ligand L to form complex AgL+.AgCl (s) + L (aq) → AgL+ (aq) + Cl- (aq)When the reaction is complete, 0.315 g of solid AgCl remains. Assume the total volume of the resultant solution is the same as the volume of the ligand solution. Ksp of AgCl in water is 1.83 x 10-10. Complete the following tasks: a) Calculate the equilibrium concentrations of [AgL+]eq and [Cl-]eq. b) Calculate the equilibrium concentration of [L]eq.c) Calculate the equilibrium constant K of this reaction:AgCl (s) + L (aq) → AgL+ (aq) + Cl- (aq) K =? d) Calculate the formation constant Kf of AgL+.Ag+(aq) + L(aq) → AgL+(aq) Kf= ?The brine solution has a significant amount of chloride, and it is determined by the Volhard method. A 10.0-aliquot of the solution is treated with 15.25 mL of standard 0.1163 M AgNO3 solution. The excess silver is titrated with standard 0.101 M KSCN solution, requiring 3.28 mL to reach the red Fe(SCN)2+ end point. Calculate the concentration of chloride in the brine solution in mg/L and g/L.1. Briefly explain why the AgCl produced in a gravimetric silver determination is inherently purer than the AgCl produced in a gravimetric chloride determination?
- 1. When Pearl added (NH4)2CO3 solution to an unknown salt solution in basic conditions, the solution remained clear and colorless. Which of the following is the metal ion present in the salt solution?a.Ca2+b.K+c.Sr2+d.Ba2+2. The unknown salt solution assigned to Hayoung produced a white precipitate with (NH4)2CO3 (in basic conditions), and the resulting precipitate is soluble in 6 M CH3COOH. Then, she added 3 drops of 1 M K2CrO4 to a portion of the original salt solution, and a yellow precipitate was observed. What is the identity of the yellow precipitate? a.Na2CrO4 b.BaCrO4 c.CaCrO4 d.(NH4)2CrO4You are assigned an unknown solution that contains Group III cations. To -1 mL of this solution was added 6 M NH3 the solution was agitated to mix well, and a reddish-brown precipitate with a gelatinous solid clinging to the inner walls of the test tube was observed. The solution was centrifuged and the supernatant was tested for completeness of precipitation by adding an additional drop of 6 M NH3. No cloudiness was observed as the drop of reagent diffused through the solution. The supernatant was then carefully decanted into a clean test tube, labeled (1st solution), and saved for further testing later. The precipitate remaining in the test tube was washed with a small amount of water, centrifuged, and the wash decanted and discarded. To the precipitate was added about 10 drops of 6 M NAOH plus ~1 mL H20 and the test tube was vigorously agitated. The resulting suspension was centrifuged and the supernatant liquid was transferred to another clean test tube and clearly labeled (2nd…A chloride unknown weighing 0.3221 g is dissolved in an acidic solution and is treated with silver nitrate. The silver chloride precipitate that forms is filtered, dried, and weighed. The weight of silver chloride obtained is 0.7332 g. Calculate the percentage of Cl- in the unknown chloride sample. Please show working clearly