Finding the Ratio of Moles of Reactants in a Chemical Reaction Purpose: The goal of the lab is to determine the mole ratio of two reactants in a chemical reaction (AgNO3 and K2CrO4). However‚ the formulas for the products are unknown. Introduction: When determining the molar ratio of a chemical equation‚ usually the formulas of the reactants and the products are known. With that information‚ it is particularly easy to determine the ratio. However‚ since the products and the formulas for
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tone of the light spectrum. Materials: Several materials were needed for the conduction of this experiment. Bunsen burners were used to generate heat. The process also required elements in liquid state‚ LiCl‚ NaCl‚ KCl‚ CaCl2‚ SrCl2‚ CuCl2‚ BaCl2‚ nichrome wire(or remove a pre-soaked wood splint)‚ small test tubes for the metal ion solutions‚ safety goggles‚ and tabs to absorb the liquids. Containers were labeled to identify each element. Observations were recorded on a data table.
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insoluble salts is prepared through precipitation reaction. Aqueous solutions containing the ions of the insoluble salt are mixed together to from the salt. The insoluble salt is formed as a precipitate and can be obtained by filtration. Example: BaCl2(aq) + Na2SO4(aq) BaSO4(s) + 2NaCl(aq) Insoluble salts can prepared by double decomposition reaction through precipitation. © MHS 2009 2 4. Procedure for the selection of the method preparing 1 specified salt. 5. Qualitative Analysis
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LAB 3: QUALITATIVE ANALYSIS Part 2- ANIONS Sameera Feroz Butt Lab Partner: Ram Soni Thursday January 30‚ 2014 Leilani Morales CHEM1131-02 OBJECTIVE The objective of this experiment was to use qualitative analysis to determine the chemical characteristics of four known anions by systemic confirmatory testing. The chemical characteristics observed were to be used to identify an unknown sample. Sulphuric acid was to be added to a carbonate solution and an effervescent reaction would
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in it with the carbon dioxide gas bubbles. 4. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) Na+ + OH- + H+ + Cl- → Na+ + Cl- + H2O(l) OH- + H+ → H2O This reaction with a strong acid‚ as noted‚ released heat‚ which we call an exothermic reaction. 5. BaCl2(aq) + H2SO4 → BaSO4(s) + 2HCl Ba+2 + 2Cl- + 2H+ + SO4-2 → BaSO4(s) + 2H+ + 2Cl- Ba+2 + SO4-2 → BaSO4(s) Here we have Hydrogen and chlorine as spectator ions. One of the solubility rules is that sulfates are soluble except in Barium. During observation
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Emission Spectra & Flame Tests Intro The emission spectrum is used in modern chemistry to help further studies of wavelengths and the spectrum. When a metal in a compound reacts in a flame and produces a color‚ it helps to show the strongest color in the emission spectrum. The purpose of performing these operations on the flame was to see how different metals would react. Using a spectroscope‚ it is possible to observe the line emission spectrum produced by sunlight‚ artificial light‚ and
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SynopsisThe objective is to determine the amount of Sulphate in anhydrous Barium Sulphate precipitate by gravimetric method. Gravimetric method is by the quantitative determination of the mass of anhydrous Barium Sulphate precipitate. Barium sulphate precipitate is form when Barium Chloride is added excessively to a hot given Sulphate solution slightly acidified with concentrated Hydrochloride acid. The white precipitate of hydrate Barium Sulphate formed is than digest‚ filtered out‚ washed and dried
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Experiment 3 Colligative Properties Freezing-Point Depression and Molar Mass By‚ Andrew Klingsporn Joby J. Chem 212 Dr. Chandana Meegoda 2/11/2009 Purpose The purpose of this experiment is to determine the Molar Mass of an unknown substance using its freezing point depression. Introduction There are two types of mixtures; homogenous and heterogeneous. Homogenous mixtures have components that are uniformly mixed‚ while heterogeneous mixtures do not. A solution is a homogenous mixture
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Investigating the Determining Characteristics of Cations and Anions Chem 111 Sec 560 Introduction: The purpose of this lab was to study the specific characteristics of cations and anions‚ and ultimately to be able to identify an unknown substance based on our studies and tests using the logic trees developed through the experiment. A logic tree is a graphical display of the findings from this lab which‚ through a series of yes/no questions‚ elimination
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of drops needed to form precipitate and the additional drops needed to dissolve to precipitate were counted. Chromate – Dichromate System Four wells of a clean spot plate was labeled 1‚ 2‚ 3‚ and 4. Wells 1 & 2 were filled with 5 drops of 0.10 M K2CrO4 each and wells 3 & 4 were filled with 5 drops of K2Cr2O7 each. Two drops of 2.0 M H2SO4 were added into wells 1 & 3‚ and two drops of 2.0 M NaOH were added into wells 2 & 4. Colors of the solution in wells 1 & 3 and wells 2 & 4 were compared. Iron
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