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An unknown and a known substance have the same Rf under identical conditions. Does this show that they are identical structures? If not what additional TLC experiments might one perform to ascertain the identity of the unknown?
the Nernst Equation to calculate the potential on the left and right. (Assume the standard potential for the left side equals 1.33 and the right side equals 0.268
determine the amount of ascorbic acid? Does the volume of ascorbic acid solution added before titration influence how much iodine solution will be needed?
Calculate Ecell for the following electrochemical cell at 25 °C Pt(s) | H2(g, 1.00 atm) | H+(aq, 1.00 M) || Pb2+(aq, 0.150 M) | Pb(s) given the following standard reduction potentials.
What is the pressure (in atm) exerted by a 2.00 mole sample of gas that occupies 2.50 L at 307.15K? The value of R = 0.0821 L atm mol - 1 K - 1 .
A tablet of Vitamin C changed color at 23.7 mLs of Iodine. how do you determine how much vitamin c is in the tablet.
When titrating 0.15 M HCl with a calcium hydroxide solution of unknown concentration, 35 mL of acid are required to neutralize 25 mL of the base.
They started with 0.47 grams of a mixture containing 0.143 grams of the acid and recovered 0.117 grams of benzoic acid. What was their percent recovery?
write mechanisms for the following reactions, which are used in chemical tests and derivative preparations: (a) the reaction of butanal with 2,4 dinitrophenylhydrazine reagent.
The standard reduction potential for the reduction of Eu3+(aq) to Eu2+(aq) is -0.43V. Which of the following substances is capable of reducing Eu3+(aq) to Eu2+(aq) under standard conditions?
How many grams of camphor (C10H16O) are needed to raise the boiling point of 43.5grams of benzene by 2.10 degress Celcius? The Kb of benzene is 2.67degress Celsius/molality.
Determine the rate constant also explain how many mg will remain after thirty nine days - A radiation biologist studies the decomposition rate of a certain substance and obtains the given data as
A 91 gram solution of silver nitrate contains 8 grams of AgNO3. What is the percent by mass of silver nitrate in this solution.
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