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Just number 6 pls. I need complete solutions for review. thank you
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- The photographs below (a) show what occurs when a solution of iron(III) nitrate is treated with a few drops of aqueous potassium thiocyanate. The nearly colorless iron(III) ion is converted to a red [Fe(H2O)5SCN)2+ ion. (This is a classic test for the presence of iron(III) ions in solution.) [Fe(H2O)6]3+(aq) + SCN(aq) [Fe(H2O)5SCN]2+(aq) + H2O() (a) As more KSCN is added to the solution, the color becomes even more red. Explain this observation. (b) Silver ions form a white precipitate with SCN ions. What would you observe on adding a few drops of aqueous silver nitrate to a red solution of [Fe(H2O)5 SCN]+ ions? Explain your observation.A Chemist collected a 0.4891-g sample of an ore for Fe determination by a redox titration with K2Cr2O7.The ore was carefully crushed prior to weighing and dissolved in HCl and using a Jones reductor the ironin the sample was brought into the +2 oxidation state. After titration with diphenylamine sulfonic acid,itrequired 36.92 mL of 0.02153 M K2Cr2O7 to reach the end point. Show your solution why 77.86% is the iron content of the ore as %w/w Fe2O3.A Chemist collected a 0.4891-g sample of an ore for Fe determination by a redox titration with K2Cr2O7.The ore was carefully crushed prior to weighing and dissolved in HCl and using a Jones reductor the ironin the sample was brought into the +2 oxidation state. After titration with diphenylamine sulfonic acid,itrequired 36.92 mL of 0.02153 M K2Cr2O7 to reach the end point. Calculate the iron content of the ore as%w/w Fe2O3
- Consider the following reaction:Al + 3KOH + 3H2C2O4 ∙ 2H2O → K3Al(C2O4)3 ∙ 3H2O + 6HO + (3/2)H21.00 g 20.0 mL 14.0 g6.00 M If 10.0 g of the complex was obtained from the reaction, what is the percent yield?A 0.8780 g sample containing only NaCl and KCl was treated with AgNO3. The AgClformed had a mass of 1.913 g. Calculate the %Na and %K in the sample. (Na=22.9897,Cl=35.453, K=39.0983, Ag=107.868, N=14.0067, O=15.9994)A 5.70 g iron ore was dissolved in concentrated HCl. After the dissolution, the resulting solution was made basic by adding 6.0 M NaOH slowly until the solution is slightly turbid. Urea was then added and the solution was heated for 3 hours. The precipitate was filtered using an ashless filter paper and ignited to form Fe2O3 (159.69 g/mol). The mass of precipitate is 2.1 g. Find the % Fe3O4 (231.54 g/mol) in the iron ore sample.
- The photographs below (a) show what occurs when a solution of iron(III) nitrate istreated with a few drops of aqueous potassium thiocyanate. The nearly colorlessiron(III) ion is converted to a red [Fe(H2O)5SCN)2+ion. (This is a classic test for thepresence of iron(III) ions in solution.)[Fe(H2O)6]3+(aq) + SCN−(aq) ⇄ [Fe(H2O)5SCN]2+(aq) + H2O(ℓ)(a) As more KSCN is added to the solution, the color becomes even more red.Explain this observation.(b) Silver ions form a white precipitate with SCN−ions. What would you observeon adding a few drops of aqueous silver nitrate to a red solution of [Fe(H2O)5 Explain your observations?Consider the coordination compound, K2[Cu(CN)4]. Between which species a coordinate covalent bond exists? a.Cu2+ and CN- b.K+ and CN- c.K+ and Cu2+ d. C and N in CN-Calculate the oxidation number of: a. Fe in Fe2O3 b. Cr in CrO4^2- c. Cr in Cr2O7^2-
- Calculate the concentration of CuS in a solution in which [H3O+] is held constant at 2.0×10-4 M.Use the following data to determine if Cr²⁺(aq) can be pre-pared by the reaction of Cr(s) with Cr³⁺(aq):Which of the following is correctly paired in the reduction of Cu2+ to Cu(s)? a. Zn-oxidizing agent b. Cu-reducing agent c. CuSO4-reducing agent d. CuSO4-oxidizing agent