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Write the principle behind the following methods of refining :
(i) Hydraulic washing
(ii) Vapour phase refining
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- Describe the principle behind each of the following processes: (i) Vapour phase refining of a metal. (ii) Electrolytic refining of a metal. (iii) Recovery of silver after silver ore was leached with NaCN.The iron content of a large lump of ore is determined by taking a single small sample, dissolving it in acid, and titrating with ceric sulphate after reduction of Fe (III) to Fe (II). What are the possible source of random and systematic errors?A 0.9352g sample of ore containing Fe³+, Al³+ and Sr²+ was dissolved and made up to 500.00 mL. The analysis of metals was performed using complexation volumetry. Initially, an aliquot of 50.00 mL had its pH adjusted to 1.0 and titrated with a standard 0.03145 mol/L EDTA solution, requiring 6.95 mL to reach the end point. Subsequently, another 25.00 mL aliquot was buffered at pH=5 and titrated with the same EDTA solution, requiring 6.24 mL to reach the end point. Finally, a third aliquot of 25.00 mL was titrated at pH=11, requiring 11.10 mL of the same EDTA solution to complete the titration. Given the molar masses: Fe=55.845 g/mol; Al-26.982 g/mol and Sr-87.620 g/mol. a) Determine the percentage of each of the metals in the sample. b) Explain why the change in pH allows the determination of the three ions in this sample.
- Explain the role of potassium hexacyanoferrate(II), K4[Fe(CN)6] as a component of the Benedict’s reagent for the Estimation of Glucosediscuss the importace and methods of solid liquid separation processes of hydro metallurgyWrite the chemical equation for the addition of MnSO4 and alkali-iodide-sodium azide in the water sample and identify the chemical identity of the white precipitate formed after the addition.
- What is the role of cobalt glass for the flame test of potassium? Explain. Why was the flame test used for the qualitative determination of K and Na? Why was the sample being made alkaline with 3M KOH and heated for the qualitative test for NH4+?Give an example of the use of a masking agent.What is the purification methods that are used for Cobalt (II) sulphate and explain them