* not completed

. Which of the following relations regarding complex formation is/are true? (Please select all that apply)

K_f2 = K_f1 / β_f2 correct incorrect

K_f1 = β_f2 / K_f2 correct incorrect

β_f2 = K_f2 x K_f1 correct incorrect

β_f2 = K_f2 + K_f1 correct incorrect

β_f2 = K_f2 / K_f1 correct incorrect

* not completed

. Which of the following statements about aqueous environments is/are true? (Please select all that apply)

Exposed acid mine drainage typically has low pH and high pE correct incorrect

Oceans typically have a pH that is somewhat higher than lakes correct incorrect

Submerged rice fields typically have a high pE and intermediate pH correct incorrect

Surface water in lakes typically has intermediate pH and low pE correct incorrect

Clean rain typically has a pH that is slightly acidic and with a high pE correct incorrect

* not completed

. Which of the following statements about pE or pE° values is/are true? (Please select all that apply)

A high value of pE means a large level of electron activity correct incorrect

The pE^o value depends on the concentration (or activity) of both oxidized and reduced species correct incorrect

For a half reaction, where pE^o is positive, ΔG^o will be negative correct incorrect

In some aqueous situations, the pE value depends on the pH correct incorrect

The relation pE  =  logK_eq / n is always true correct incorrect

* not completed

. On a pE/pH diagram, the line separating MnO₄^- / MnO₂ will:

Be vertical correct incorrect

Slope downwards from left to right correct incorrect

Slope upwards from left to right correct incorrect

Be horizontal correct incorrect

Have a slope that depends on the concentration of the two Mn species correct incorrect

* not completed

. On a distribution diagram describing complexation of zinc by chloride (up to ZnCl₄), which of the following statements will be true? (Please select all that apply)

The fraction Zn²⁺ declines consistently with increasing chloride concentration correct incorrect

The fraction of ZnCl⁺ declines consistently with increasing chloride concentration correct incorrect

The K_f1 value will be greater than K_f2 correct incorrect

The K_f2 value will be greater than K_f1 correct incorrect

The fraction of ZnCl₄^2- increases consistently with increasing chloride concentration correct incorrect

* not completed

. On a pE/pH distribution diagram, which of the following is/are true? (Please select all that apply)

Vertical lines separate species that are in acid-base equilibrium. correct incorrect

Non vertical lines separate species related by redox equilibria. correct incorrect

Horizontal lines separate species in redox equilibria not involving hydrogen or hydroxide ions. correct incorrect

Diagonal boundaries separate species in redox equilibria in which hydroxide or hydrogen ions are involved. correct incorrect

Lines at the top and bottom of the plot are drawn to indicate the region of water stability. correct incorrect

* not completed

. Which of the following statements about distribution diagrams is/are true? (Please select all that apply)

Single variable species distribution diagrams work well for monoprotic acids but not for polyprotic acids correct incorrect

The form of the equations used to create a distribution diagram for carbonic acid will be the same as that for hydrogen sulphide correct incorrect

You must know the concentration of the acid to make a distribution diagram correct incorrect

In order to obtain the alpha value for a species, it is necessary to have access to a plot of the distribution diagram correct incorrect

To create a distribution diagram for a diprotic acid you only need to know K_a1 and K_a2 correct incorrect

* not completed

. Which of the following statements about 'line c' on Figure 10.5 is/are true? (Please select all that apply)

It is unaffected by pH correct incorrect

It is affected by the concentration of H₂S correct incorrect

It defines the boundary between SO₄^2- and S^o correct incorrect

It ceases to exist below pE near -3 correct incorrect

It is defined by pE = 5.625 - 1.333pH correct incorrect

* not completed

. Which of the following statements about pE measurements is/are true? (Please select all that apply)

pE in the natural environment can't be measured directly correct incorrect

pE is determined by the potential generated at an inert electrode that is immersed in an aqueous system correct incorrect

An indicator electrode for pE measurements can be as simple as a piece of platinum wire correct incorrect

No reference electrode is needed when measuring pE correct incorrect

pE measurements, although possible in the natural environment, may be unstable due to non-equilibrium conditions correct incorrect

* not completed

. In making a pE measurement in a marine sediment, the potential was found to be -0.592 V versus the SCE. Which of the following is/are true? Please select all that apply.

The pH is likely to be less than 2 correct incorrect

The measurement is faulty due to the negative value obtained correct incorrect

The calculated pE value is -0.35 correct incorrect

The potential versus the NHE is -0.35 V correct incorrect

The calculated pE value is -5.9 correct incorrect