Blog

1.6 Choose the correct answer:     Which facts, in the passage, show that something is not right with Bryan’s body? (1)

Consider the formation reaction shown using the metal Snapeium (symbol Sp) and monodentate ligand L: Sp+(aq)  + [n] L (aq) SpL[n]+ (aq)  A solution initially has concentrations of Sp+ = 0.1[a]0 M and L = 0.0[b] M. When concentrations become constant the concentration of SpL[n]+ was found to be 0.0[c]0 M.       Calculate the formation constant, Kf. You must show work for full credit in your upload. Enter your answer in decimal form with correct sig figs. If you have difficulty in Canvas not accepting your answer, make sure it’s clearly shown in your work upload.

Pyridazine has the formula C4H4N2. A buffer is made by mixing solutions of pyridazine and pyridazinium chloride HC4H4N2Cl. Which one of the following is a correct NET IONIC equation for the reaction that occurs when a small amount of strong acid HCl is added to this buffer?  

Let’s compare two hypothetical complexes: CoL62+ is pink (light red) and VL62+ is lavender (blue-violet). L is a neutral ligand. These two complexes have the same number of unpaired electrons.  A. On your paper, draw a labeled orbital diagram for each complex, showing the electron occupancy, labeling each d orbital. B. Based on this evidence, is CoL62+ high spin, low spin or not applicable? [comp1]   C. Which complex has the largest crystal field splitting energy? [energy] Explain your answers in the work you upload.  

For the following complex,  K[ Au(CN)4 ] The coordination number is [CN] The metal charge is [charge] The d electron count is d[e] The likely geometry of the choices given is [geom]

For the following complex,  [ Rh(en)2NH3Br]NO3 The coordination number is [CN] The metal charge is [charge] The d electron count is d[e] The likely geometry is [geom]

Will the following mixtures produce a BUFFER solution? 40 mL of 0.1 M HCl plus 50 mL of 0.1 M KNO2    

Will the following mixture produce a BUFFER solution? 30 mL of 0.2 M NH3 plus 30 mL of 0.2 M NaNH2

Wingardic acid is a madeup monoprotic acid that has a Ka of 5.7×10-6. Consider the titration of 36.00 mL of 0.420 M wingardic acid with 0.560 M NaOH. Note that the concentrations are not the same. Make sure sig figs are correct on your answers. Don’t round until the end. Show your work on your upload for full credit. As usual, work should follow examples as in lecture, showing BRA and/or ICE tables if appropriate and any assumptions you are making. You can use a generic HA for the acid formula. A.  The half equivalence point will be at ______ mL of titrant added and have a pH of ______? vol titrant = [v1] mL pH = [ph1] B. The equivalence point will be at ______ mL of titrant added and have a pH of ______? vol titrant = [v2] mL pH = [ph2] C.  What is the pH at the point when 30.5 mL of titrant are added? pH = [ph3]               

Based on what we learned in lecture, how many unpaired electrons would a high spin octahedral Mn0 complex have, if such a complex existed?