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In this experiment we reduced methylene blue with ascorbic acid using HCl as a catalyst. Given that the half reaction for the reduction of methylene blue is MB+(ox) +2H +2e ----->MBH2(red) (potential = 100 mV). Explain whether or not dissolved oxygen in the reactants has an affect on the reaction. Write all half reactions involved.
Compute the a)molarity of the solution, b)molality of the solution, c) mole fraction of Ammonia.
The student rinses the sample into a small beaker using distilled water, and then titrates the solution with a 0.500 M HCl solution. 12.00 mL of the HCl solution is needed to reach the endpoint of the titration. Calculate the value of Ksp for borax..
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?
Calculate the total concentration of lead dissolved ([Pb]total) in a solution saturated with PbI2(s) and containing dissolved I- with a concentration of [I-] = 0.294 M. The solubility of lead is governed by the reactions shown below.
If 2.50 g CuSO4 are dissolved in 8.0 x 102 mL of 0.25 M NH3, what are the concentrations of Cu2+, Cu(NH3)42+, and NH3 at equilibrium
Draw the monobromination product that would be obtained from the radical bromination of methylcyclohexane? which product would obtained in greatest yield?
Complete and balance the equation for this reaction in basic solution. Phases are optional.
What makes Maleic acid (isomer of but-2-enedoic acid), very soluble in water and only sparingly soluble in CCl4
Why is it important to the place the thermometer bulb at in the lower part of the Hickman still head. What will happen if you place it either a)too low or b)too high in the condenser
A 0.003525-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 24.5oC to 26.7oC.
Is 373 K a high temperature? Some thermodynamic principles only hold at "high temperature". How is "high temperature" defined
If the endpoint is surpassed in the back-titration with NaOH, will the reported amount of antacid in the sample be too high or too low?
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