# Clear handwriting The Zn-S-O-H20 Eh-pH diagram and the hydroxide precipitation diagram shown below from the literature...

Clear handwriting   The Zn-S-O-H20 Eh-pH diagram and the hydroxide precipitation diagram shown below from the literature is useful in predicting leaching and precipitation reactions of sulfides and oxides/hydroxides. Answer the following questions relevant to these diagrams (a) Write the balanced chemical equations relevant to zinc leaching in solutions represented by lines 4, 5, 18 and 19
(b) Calculate the theoretical pH of a solution of 12 mol/L NaOH at 25 °C, assuming unit activity coefficients (H2O=H*+OH;; K = 1014 at 25 °C). (c) Predict whether you can you use the solution in part (b) to leach ZnO: If the answer is "Yes" what is the product? Write a balanced equation for the chemical reaction. (i) If the Answer is "No" explain why. (ii) (d) Would you expect the pH to be as high as 16 (or above) at 25 °C as indicated in the diagram? Give reasons for your answer. (e) The electrolyte solution in a zinc plant has a composition of 1 mol/L zinc(II), 1 mol/L magnesium(II), and 1 mol/L sulfuric acid. It has a flow rate of 0.7 m/h. Use the solubility diagram of hydroxides at 25 C to estimate the rate of addition of lime ((Ca(OH)2, th) to precipitate zinc ions as Zn(OH)2 at pH 7 (Ca 40, O0= 16, H= 1) ZnS-H20 System Gons IM, H2S I atm) 0.5 10 Zn2 2 NSO n2 ZnO(a) 19 20 so Zn2 18 Zno H20 22 H2S(9) -0.5 so 12 ZnS(s) 1 13 15 24 Zno Zn(s) 16 17 H2S() H2 Znle) HS (aq) Zn(a) s2- -2.0 10 12 14 16 16 20 Zn-S-O-H2o Eh-pH diagram at 25 °C (A) Potential En(V)
Zn2 Mg 10 11 12 13 14 pH (B) Solubility diagram for metal hydroxides at 25 °C uou, Lwl)60   ##### Add Answer of: Clear handwriting The Zn-S-O-H20 Eh-pH diagram and the hydroxide precipitation diagram shown below from the literature...
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