Question

water a) Without calculation, but referring to the appropriate dissociation constants, carefully sketch a single variable species distribution diagram (versus pH) for this acid in water (b) Calculate accurately the concentration of all the sulphite species at pH 7.0. Set up a spreadsheet calculation to examine the acid-base speciation of arsenate over the pH range 0 to 14. What is the % distribution of species in acid mine drainage whose pH is 4.9? Use standard thermodynamic relations and assumptions to show that 2. 3. n(pE) log K 4. Consider the equilibrium of an aqueous solution containing solid manganese dioxide as indi- MnO; (aq) +4H,O (aq) +3e MnO, (s) + 6H,O cated in the following equation. How are the solution's pH and pE affected by the individual addition of each of the followin g: MnO, CO, (g), Fe (aq), and CaCO,? 5. A potential measurement in a paddy field yields a reading of -278 mV versus the saturated calomel reference electrode. What is the pE value for this soil? 6. Iron toxicity has occasionally been observed in rice plants grown in lowlands (submerged soils). Use the simple pE / pH diagram for iron in Fig. 10.P.1 to explain how this can happen.

Just Question 2

please I need a full and correct answer for this question by clear hand Writing

Answer 1

다») 10 : 4,9 5 だ2.689 X10" mol dm nn O 5 5 2 0.0012589 인.