Calculate the freezing point of two aqueous solutions, one containing 15% magnesium chloride by weight, the other 15% ethyl alcohol (CH3CH2OH) by weight. show all calculations
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The Ka of benzoic acid is 6.5 x 10 ^(-5)
a) Calculate the pH of a 40.00 mL, 0.1 M benzoic acid buffer solution after the addition of 20.00 mL of a 0.1M NaOH
b) Calculate the pH of a 40.00 mL, 0.1 M benzoic acid buffer solution after the addition of 50.00 mL of a 0.1M NaOH
REDOX TITRATION
2) Express the reactions for potassium permanganate titration with sodium oxalate: Hint: include the 2 half-reactions.
3) What is the percent oxalate in a 1.723 g sample if 31.10 mL of 0.019M permanganate solution is required for titration?
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: carbonyl(CO) is strong field ligand so [Ni(CO)4] should have square planar shape but by the experiment [Ni(CO)4] is tetrahedral.Explain this statement.
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How may grams of solute are needed to prepare the following solutions?
1.000L of 240.0M NaCl
250.0 mL of 0.135 M CuSO4
500.0 mL of 0.370 M CH3OH
Also, please tell how you got answers so I can know how to get calculations myself. THANK YOU :-)
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A conductivity cell when standardized with 0.01 M KCl was found to have a resistance of 189 Ω. With 0.01 M ammonia solution the resistance was 2460 Ω. Calculate the bas dissociation constant of ammonia, given the following molar cconductivities at these concentrations: λ(K+) = 7305 Ω-1cm2mol-1; λ(Cl-) = 76.4 Ω-1cm2mol-1; λ(NH4+) = 73.4 Ω-1cm2mol-1; λ(OH-) = 198.6 Ω-1cm2mol-1.
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If the student uses 5.00 grams of (CH3)3CCO2H, how many grams of Mo(CO)6 will the student need to react completely with the (CH3)3CCO2H.
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A student weighs by difference 0.1956g of sodium oxalate into a 100ml Volumetric flask and dilutes to the mark 10mL of HCI and 90mL of distilled water. The student then pipetted a 25mL aliquot of the ocalate solution to a 125mL Erlenmeyer flask. Approximately how many mL's of 0.02 M KMnO4 would be requied to reach the equivalence point of the trtration?
The balanced alf reactions are:
Reduction: MnO4- + 8H+ + 5e- --> Mn2+ + 4H2O
Oxidation: C2O4 2- ---> 2CO2+ 2e-
Combining (and balancing) the two half reactions yields:
2MnO4 2- + 5 C2O4 2- + 16H+ ---> 2Mn2+ + 10CO2 + 8 H2O
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10)Explain briefly what happens when you eat french fries; describe the step by step process of what happens to the glucose units in the starch as they go through the different stages.
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Identify the peaks for Raman or Rayleigh on a emission/excitation spectrum for dilute quinine and for dilute sulfuric acid.
spectra are not provided
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Explain how the same protein can migrate differently on SDS page
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Indicate the concentration of each ion present in the solution formed by mixing
c) 3.60g of KCL in 75.0mL of .250M CaCl2 solution.
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You placed 6.35 g of a mixture containing unknown amounts of BaO(s) and MgO(s) in a 3.50-L flask containing CO₂(g) at 30.0°C and 750. torr. The solid BaO and MgO in the flask completely reacted to form BaCO₃(s) and MgCO₃(s), respectively. After the reactions to form BaCO₃(s) and MgCO₃(s) were completed, the pressure of CO₂(g) remaining was 245 torr, still at 30.0°C. Calculate the mass of BaO(s) in the initial mixture. (Assume ideal gas behavior).
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What is the van Deemter equation, and how can it be used to improve a separation? Support your answer with a sketch of a typical van Deemter plot, making sure to label your axes.
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Find the pH and equilibrium concentrations of all species of a 25 M H2SO3 solution at 25 degree C.
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