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Mass of zinc = 1.050 g.
Calculate the number of moles of Zn2+ in the 20 mL aliquot. show working out please
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- 1. Differentiate the Faians method from the Volhard method of precipitation titrimetry, Include key information such as indicator used, endpoint, analytes, and the chemical reactions.The table below shows a summary of precipitation indicator methods used in titrimetric analysis. Complete the table by filling in the missing information (I – VI - Precipitate at End point End- pH Method Analyte Туре Mechanism Indicator point Color range Chromate Red- (1) CI & Br Direct Complexation Neutral Ag:Cro. (Cro.?) brown Indirect 1. AgCI 2. FESCN? Volhard CI & Ag* (1II) (Back titration) (IV) Acidic (VI) Weak acid Neutral - Fajan (11) Adsorption (V) dye (E.g. FIO') Red Acidicconical lask Indicator and alkali
- 1. One of the methods of eliminating interferences, is by adding solvents to the solution in which components to be removed are soluble, which method is this? a. Complexation b. Extraction lon-exchange d. Precipitate С. 2. Which of the following properties of precipitates is desired in gravimetry? a. Large b. Pure С. Free of contaminants d. All of the choicesWhich of the following would keep the relative super saturation at minimum during precipitation? 1. OElevated temperature. 2. ODilute solutions. 3. OSlow addition of precipitating agent with good stirring 4. O All of the above.Please help me out with making flowchart with thes steps. Write the result. Procedure 1. Place 20 drops of each of the following aqueous solutions to separate centrifuge tubes: 0.1M Cr (NO3)3, 0.1M Al (NO3)3, 0.1M Co (NO3)2, 0.1M Zn (NO3)2, 0.1M Mn (OH)2, 0.1M Ni (NO3)2, 0.1 M Fe (NO3)3. Make each solution basic by adding few drops of 6M NH4OH. Confirm using a litmus paper. 2. Add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Place the samples in the centrifuge machine for 3 mins. After centrifuge record results. Decant the supernatant liquid of all the samples. 3. Add one drop of NH4OH in each centrifuge tubes. Add 20 drops of distilled water in each centrifuge tubes. Then add a few drops of 6M HCl in each solution. Place the samples in the water bath for 10 mins. After water bath, centrifuge the samples for 3 mins. 4. After centrifuge, add a few drops of 6M NH4Cl in each sample. Decant the supernatant liquid in each sample. 5. To the centrifuge containing…
- What is observed when equal volumes of 0.1M aqueous HCl and 0.01 M Na2SO3 are mixed? Group of answer choices Colorless solution and a white precipitate. Colored solution and a white precipitate. Colorless solution and a colored precipitate. Colorless solution, no precipitate and gas evolution.A few drops of aqueous sodium hydroxide were added to aqueous chromium(III) * nitrate. and the test-tube shaken to mix the solutions. The observation will be A green Precipitate O B Red brown precipitate C light blue precipitate D White precipitate OA silver nitrate soluti on contains 14.77 g of primary standard AGNO3 , in 1.00 L what volume of this solution is needed toreact completely with 50.00 ml. of 0.01808 M Na2S. 1. O10.40 ml. 2. O 20.79 ml. 6.10 ml. 4. O12.31 ml. 5. O18.21 ml. 3.
- 4. Analysis of a water sample yield the following result: DESCRIPTION Volume of silver nitrate for sample titration Volume of silver nitrate for blank titration Normality of silver nitrate solution Volume of sample taken Calculate chloride (mg/L as Cl) content of the water sample. DATA 5.6 mL 0.56 mL 0.0154 N 100 mlA solid chloride sample weighing 0.09969 g required 18.25 mL of 0.05205 M AGNO3 to reach the chromate end point. What is the % chloride in this sample?The graphic below shows the general procedure for titrating the saturated solution of magnesium hydroxide with hydrochloric acid. Select all of the true statements from the choices below. 1. Obtain a saturated solution of magnesium hydroxide. 0 2. Transfer 30.0 mL to an Erlenmeyer flask using a volumetric pipet. Add phenolphthalein. 3. Titrate to a colorless endpoint using 0.0020 M hydrochloric acid. It is important that the aliquot drawn in step 2 does not contain undissolved magnesium hydroxide solid. For titrations of the saturated solutions at elevated temperatures, the solution must be held at high temperature for the duration of the titration. Hydrochloric acid is the analyte in this titration. The volume of liquid in the buret should be read before and after the titration. At the endpoint of the titration, the solution will turn from colorless to pink.