hydrochloric acid is not sufficiently pure. 8. Can any of the following be used as primary standards: NaOH‚ H2SO4‚ HNO3? Explain your answer. – A primary standard should be available in a highly pure state and stable. None of these substances are available pure because: (a) NaOH readily absorbs water and carbon dioxide from the air. (b) Concentrated H2SO4 readily absorbs water from the air. (c)HNO3 breaks down releasing NO2 gas.
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H2 → __ Sn + __ H2O Question 2 __ KOH + __ H3PO4 → __ K3PO4 + __ H2O Question 3 __ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3 Question 4 __ Na3PO4 + __ HCl → __ NaCl + __ H3PO4 Question 5 __ TiCl4 + __ H2O → __ TiO2 + __ HCl Question 6 __ C2H6O + __ O2 → __ CO2 + __ H2O Question 7 __ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 + __ H2 Question 8 __ NH3 + __ O2 → __ NO + __ H2O Question 9 __ B2Br6 + __ HNO3 → __ B(NO3)3 + __ HBr Question 10 __ NH4OH + __ Kal(SO4)2·12H2O → __ Al(OH)3 + __ (NH4)2SO4 + __ KOH + __ H2O
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Oxides Research 1. Assess evidence‚ which indicates increases in atmospheric concentration of oxides of sulfur and nitrogen. Thorough collection of data‚ surveys‚ and tests from the 1950’s indicate a rising trend in atmospheric concentrations of oxides of sulfur and nitrogen. An enhancement in funding‚ technological and information resources‚ has led to wider and more detailed analyses of oxides of sulfur and nitrogen concentrations‚ and as the diagrams indicate (see diagrams) there is a clear
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Chemistry Investigatory Project Anand Vihar School Bhopal Topic: Study of Adulterants in Food Stuffs Submitted By: Submitted To: Devanand Vyas Mrs. Surbhi Mam XII XII ‘A’ 25 Acknowledgement I owe a great many thanks to a great many people who helped and supported me during the writing of this book. My deepest thanks to
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The purpose of this experiment was to determine the weight percentage of copper in brass. This was achieved by performing a redox titration known as iodometry. Copper‚ which was obtained from the brass‚ was used to react with iodide to produce iodine. Iodine was then titrated with thiosulfate. In this experiment‚ the amount of titrant dispensed correlates with the amount of copper; therefore‚ the amount of copper in brass was calculated by using the data recorded. In this experiment‚ the analyte
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Learning Goal: To understand how the scientific method can be used to search for explanations of nature. The scientific method is a procedure used to search for explanations of nature. The scientific method consists of making observations‚ formulating hypotheses‚ designing and carrying out experiments‚ and repeating this cycle. Observations can be either quantitative or qualitative. Quantitative observations are measurements consisting of both numbers and units‚ such as the observation that ice melts
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dissolve faster‚ decreasing the time of reaction. This is the same reason why the solution is heated in order to coagulate because it speed up the particles inside the solution decreasing the time it needs to complete the reaction. It is smart to use HNO3 when washing down the precipitate because when the AgCl(s) precipitates the particle decrease in size allowing it to pass through the filter paper. The precipitates are then heated in attempt to evaporate all the water until it precipitate is virtually
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remaining contents of crucible in no more than 1-2 mL DIW Add a drop of 6 M HAc (CH3COOH) and 2-3 drops of sodium cobaltinitrite reagent. If yellow precipitate forms‚ K+ is present Cl- Test Place 10-20 drops of sample solution in vial‚ and add 1 M HNO3 dropwise until solution is acidic. (Test acidity by touching tiny quantities of test solution to blue litmus paper until litmus turns red.) Add one drop 0.02 M AgNO3 to solution If cloudy precipitate forms‚ Cl- is present HSO4- /SO42- Test Place
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r Lab Report 5 Introduction to the Classes of Chemical Reactions Course: Chem. 1151L‚ Tuesday & Thursday June 23‚ 2011 Mr. Nasir Uddin Pre Lab Questions: 1. CaBr2 (aq) + K3PO4 (aq) → CA(PO4)2(S) + KBr (aq) = Ca3(PO4)2 + 6 KBr Double Replacement 2. Li(s) + O2(g) = Li2O(s) =2 Li2O Decomposition 3. CH4 + O2 = CO2 + H2O = CO2 + 2 H2O Combination 4. AgBr(s) = Ag (s) + Br2(l) = 2 Ag + Br2 Combination 5. Mg(s) + H2SO4 (aq) = MgSO4 + H2
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Instructions You must SHOW WORK AND PROBLEM SET-UP for CREDIT. You have to SUPPORT your answers by calculations and/or reasoning. If you do not understand something in the assignment or are not sure how to approach a question - EMAIL me before you submit. This assignment must be submitted no later than November 22nd‚ 2011. 1. What is a true solution? Explain why the solute does not settle out of a solution. Is it possible to have one solid dissolved in another? Explain. In metals it would
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