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A solution is known to contain Bi3+ ion or Cd2+ ion or both. Describe the test(s) that could be used to separate and identify these ions. Describe the results you would expect to see for each ion, if that ion were present.
Calculate the energy levels of the pi-network in octatetaene, C8H10, using the particle in the box model. To calculate the box length, assume that the molecule is linear and use the values 135 and 154pm for C--C and C-C bonds.
 What is the pH of the acidic solution before titration? 4.  What is the pH of the reaction mixture after 10.0 mL of NaOH was added?
An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
Calculate the value of Avogadro's number to three significant figures based on these data. (Note: the value may differ from the tabular value).
A chemist wants to make 4.5L of a 0.340M CaCl2 solution.What mass of CaCl2 (in g ) should the chemist use?
The pka of the amino group is 9.20. Calculate the pI for tyrosine. At what pH is the side chain of tyrosine 1/4 ionized?
The titration curve of a 1.00 M unknown acid solution shows that the pH at the equivalence point is 9.16 and the pH halfway to the equivalence
Determine the mass of Cr 3 + in the original solution if The total mass of the precipitate = 49.6 .
The rate constant for the first-order conversion of A to B is 3.33hr-1. How much time will be required for the concentration of A to reach 75% of its original value?
Calculate the density of N2 at STP, (a) using the ideal-gas law and (b) using the molar volume and molar mass of N2.
Several significant signals have been identified on the spectrum. Assign these signals to corresponding functional groups in the molecule of aspirin
Rank the following titrations in order of increasing pH at the equivalence point of the titration (1 = lowest pH and 5 = highest pH).
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