A current of 5.42 A is passed through a Ni(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 5.00 g of nickel? (Please show all steps)
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As a technician in a large pharmaceutical research firm, you need to produce 350. mL of a potassium dihydrogen phosphate buffer solution of pH = 6.91. The pKa of H2PO4− is 7.21.
You have the following supplies: 2.00 L of 1.00 M KH2PO4 stock solution, 1.50 L of 1.00 M K2HPO4 stock solution, and a carboy of pure distilled H2O.
How much 1.00 M KH2PO4 will you need to make this solution? (Assume additive volumes.)
Express your answer to three significant digits with the appropriate units. Please show all steps.
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What is a drying agent? When do you use it? What is the drying agent used in the lab? How much drying agent do you use? It has been suggested that drying agents can be collected after an experiment and the hydrated salt heated in an oven to drive off the water. The recycled drying agent can then be used again for another experiment. Is this a good idea? Give advantages and disadvantages of this proposal.
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Give a breakdown on reduction and oxidation with relation to alcohols and the possible reagents that are used to do so.
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The pOH of an aqueous solution of 0.366 M hypochlorous acid is __________
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what relevance does the song "We didn't start the fire" by billy Joel relate to stereochemistry in organic chemistry? Can you give an example using a molecule?
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1) calculate the [OH-] of a solution having a [H3O+]=2.85x10-6M.
2) A solution is tested with a series of indicatores. the solution turns blue when bromcresol green is added, it turns purple when bromcresol purple is added, and its colorless when phenolphthalein is added. what is the estimated pH of this solution?
3) how does a pH indicator work? provide an equilibrium equation to illustrate your answer.
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Show how it is possible to get the other state functions, G, A, and H, from just S and U.
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Which one of the isomeric C3H9N amines would you expect to have the lowest boiling point? Explain your choice.
CH3CH2CH2NH2, CH3CH2NHCH3, (CH3)3N, (CH3)2CHNH2
Please explain why.
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1. Assign oxidation numbers to the Iron atoms of Magnetite. Recall Magnetite's chemical formula Fe3O4 is better written as FeOFe2O3.
2. Sketch electron filling of the d-orbitals for the Fe3+, Fe2+, Gd3+ and Y3+ ions. Rank them according to increasing paramagnetism.
3. Hessonite (Cinnamon Stone) is a variety of Grossular which is a Calcium-Aluminum rich garnet gemstone with a formula of Ca3Al2(SiO4)3.Would you expect this garnet to be magnetic? Explain.
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Suppose that 26 mL of 0.10 M HCl is added to 1.000 L of saturated Mg(OH)2' which contains more than enough Mg(OH)2(s) to react with all of the HCl.
A.) After the reaction has ceased, what will the molar concentration of Mg2+ be?
B.) What will the pH of the solution be?
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Freezing point depression experiment
1/what effect does the presence of a nonvolatile solute have upon the freezing point of a solution?
2/Explain the diffrence between molarity and molality. What are the units on each?
3/what is the molality of a solution that contains 5.2g of urea(molar mass = 60g/mol)in 250g of benzene(c6H6)?
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Benzene has a ΔHvap = 33.90 kJ/mol and a ΔSvap = 96.4 J/mol-K. What is the vaporization temperature of Benzene in Celsius?
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38)What is the experimental yield (in g of precipitate) when 17.8 mL of a 0.6 M solution of sodium chloride is combined with 16.5 mL of a 0.674 M solution of silver nitrate at a 88.5% yield?
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