a) Copper solutions are typically blue to blue green in color.What color of light would they be expected to absorb in thegreatest amount?
b) Based on your answer to theprevious question (hopefully you have the correct answer), whatwavelength range would you expect to see the maximum absorption oflight (in the visible range)?
| | 500 nm to 600 nm |
| | 400 nm to 500 nm |
| | 300 nm to 400 nm |
| | 600 nm to 700 nm |
c) Given the information that thetartrate ion is the conjugate base of a weak acid, how do youexpect the solubility of copper (II) tartrate to be affected bypH?
| | decreased with lower pH. |
| | increased with lower pH. |
| | most soluble at pH = 7 |
| | no change in solubility with pH. |
d) It was an intention to have a common ion experiment with thelab, but it did not work when we tested the experiment. What wouldthe solubility of copper (II) tartrate be in a solution thatcontains 0.19 M sodium tartrate? (Use the literature for copper(II) tartrate Ksp = 4.0 x 10-4) Please enteranswer in standard notation.
e) Your value forKsp will not bethe same as the literature. It may not even be close. It is likelyto be larger than the literature value. What is one logical reasonyour value may be larger?
| | evaporation of water leads to a more concentrated solution withgreater solubility. |
| | the accuracy of our spectrometers leads to lower than expectedcopper concentration readings. |
| | the gravity filtration used might not be very effective atremoving small undissolved solid particles from the saturatedsolution. |
| | students just cannot get results that are as good as trainedexperts. |
