Place 10 drops of zinc nitrate into A3 of the 24 well plate. 5. Place 10 drops of iron (III) chloride into A4 of the 24 well plate. 6. Place 10 drops of copper (II) sulfate into A5 of the 24 well plate.
Focus questions 1. What is the Percent Zinc of Zinc Iodide as determined by a Titrimetric analysis? Using the Zinc Iodide (elemental synthesis), we found the percent zinc to be 21.94%. Using the Zinc Iodide (standard synthesis), we found the percent zinc to be 21.87%. This averages to 21.9% zinc.
4. Chlorine, Cl 2, is a strong oxidizing agent found in bleach. 10.0 cm3 of bleach solution was added to 25.0 cm3 of 0.4M Sn2+ solution acidified with sulphuric acid and made up to 100 cm3. 10.0 cm3 of the resulting solution containing the unreacted Sn2+ was titrated against 0.02M K2Cr2O7. Given that 11.40 cm3 of K2Cr2O7 was required for complete oxidation, a) Calculate the numbers of moles of Cr2O7- used.
What mass of MgCO3 is contained in a 2.750g solid sample consisting of only MgCO3 and MgO if heating to decompose all the MgCO3 according to the following equation leaves a solid residue weighing 2.160g? Magnesium oxide is unaffected by the heat. MgCO3(s) MgO (s) + Co2 (g) 2. a) Consider the reaction of question 2. Suppose a 3.250 g sample containing only MgCO3 and MgO is 42.6% MgO. How many grams of CO2 would be liberated by complete thermal decomposition of the MgCO3 in the sample?
Gravimetric Analysis of a Metal Carbonate Post Lab TABLE Mass of Crucible + M2CO3 14.8145g Mass of Crucible + M2CO3 (1st weighing) 14.7915g Mass of Crucible 12.9405g Mass of M2CO3 1.851g Mass of filter paper + CaCO3 3.8025g Mass of filter paper 1.8120g Mass of CaCO3 1.9905g Moles of CaCO3 0.019887 mol Molar mass of M2CO3 93.08 g/mol Identity of M2CO3 Na2CO3 Percent Error 12.18% error ANALYSIS QUESTIONS 1. Calculate the moles of precipitated calcium carbonate, CaCO3. Enter this value in the Data Table. 1.9905g CaCO3 x 1 mol CaCO3 = 0.019887 mol CaCO3 1 100.09g 2. Calculate the molar mass of the unknown carbonate.
What is the identity of the element Z? The two reactions are: Z(OH)2(s) + 2HCl(aq) →ZCl2(aq) + 2H2O(l) HCl(aq) + NaOH(aq) →NaCl(aq) + H2O(l) [Ans. : Mg, calculated molar mass 24.31 g] 6) A sample of “compound X,” known to contain only C and H, was burned and the resulting CO2 and
How could it have been improved? (b) Based on your evidence, which anion could be used to precipitate most of the metal cations? (c) Which anion could be used to selectively remove silver ions from solution? Why? (d) What evidence suggests that nitrate compounds are soluble in water?
Through our identification tests, we identified the gray solid to be zinc granules, the colored solution to be zinc ion and iodine-iodide-triiodide ion in water and the white solid to be solid zinc iodide. These identifications compared well with two other groups data. Ismat Zerin and Savita’s group also identified these substances to also be zinc granule, zinc ion and iodine-iodide-triiodide ion in water, and zinc iodide. Even though our conclusion was the same, our identification results did differ to some extent. For the identification test for the gray solid, we all concluded that this substance showed negative results for every chemical tested except for the zinc metal.
Experiment 29 Hydrometallurgy to Analyze a Chromite Sample: A Self-Directed Experiment Bret Eady, Seth Berry October 17, 2010 INTRODUCTION: The only ore containing chromium is chromite. Chromite is a combination of iron, magnesium, chromium, and oxygen. The chromium from the chromite is used for many constructional purposes such as: the production of stainless steel, enhancing the structural integrity of many metals, and reducing the rate at which they corrode. Sometimes the composition of chromite may vary and the iron in chromite may be replaced by magnesium. Also, the chromium in chromite may sometimes be replaced by aluminum and ferrous ions.
Purpose of investigation: Picture 3 The purpose of this investigation was to see if concentration affects the rate of reaction between Magnesium and Hydrochloric acid. Magnesium is one of the key reactants in the experiment. Magnesium is a chemical element found in the periodic table with the chemical abbreviation of ‘Mg’.It is a soft, light, silver/white metal and has an atomic number of 12 and an atomic mass of 24 and is the eighth most abundant element on the earth [1]. It is an alkaline earth metal and consists of 12 protons, 12 neutrons and 12 electrons. However the number of neutrons differs as there are different isotopes of Magnesium (Mg, solid).