What inferences can be made? NaOH was added to a blue-green solution (Fe3+, Ni2+, Mn2+, Cr3+,...

What inferences can be made? NaOH was added to a blue-green solution (Fe³⁺, Ni²⁺, Mn²⁺, Cr³⁺, and/or Zn²⁺). After stirring, the solution appeared light green with no precipitate.

Expert Solution

All given acidic radicals (Fe³⁺, Ni²⁺, Mn²⁺, Cr³⁺, Zn²⁺) on addition of strong base NaOH forms there hydroxides which may or may not be soluble in NaOH solution depending on their solubility product(Ksp) values.

Fe³⁺ (aq.) + 3OH^-(aq.) ------> Fe(OH)₃ (ppt.)[Ksp = 3.8 x 10^-38]

Ni²⁺ (aq.) + OH^-(aq.) ------> Ni(OH)₂

Mn²⁺ (aq.) + 2OH^-(aq.) ------> Mn(OH)₂ (ppt.)

Cr³⁺ (aq.) + 3OH^-(aq.) ------> Cr(OH)₃(ppt.)[Ksp= 2.9 x 10^-29]

Zn²⁺ (aq.) + 2OH^-(aq.) ------> Zn(OH)₂

But observation says no precipitation occurred hence following inferences can be drawn,

1)III-group radicals Fe³⁺ and Cr³⁺ are certainly absent in the solution as there hydroxides are insoluble in water and in basic (excess NaOH) solutions.

2) IV-group radicals Mn²⁺ and Ni²⁺are also certainly absent as their hydroxides also do not dissolved in even excess NaOH (Basic) solution.

3)IV-group radical Zn²⁺ may present because its hydroxide Zn(OH)₂ is soluble in excess NaOH solution by forming sodium zincate (Na₂ZnO₂ or Zn(ONa)₂) which might have faded the color of solution to light green.

==================================================================================

queen_honey_blossom answered 2 years ago

If a 0.100 M solution of NaOH is added to a solution containing 0.200 M Ni2+,...

If a 0.100 M solution of NaOH is added to a solution containing 0.200 M Ni2+, 0.200 M Ce3+, and 0.200 M Cu2+, which metal hydroxides will precipitate first and last, respectively? Ksp for Ni(OH)2 is 6.0x10?16, for Ce (OH)3 is 6.0 x 10?22, and for Cu(OH)2 is 4.8x10?20. A) Ni(OH)2 first, Cu(OH)2 last B) Cu(OH)2 first, Ni(OH)2 last C) Ni(OH)2 first, Ce(OH)3 last D) Cu(OH)2 first, Ce(OH)3 last E) Ce(OH)3 first, Cu(OH)2 last Give detailed explanation

Qualitative scheme for seperation of ions Ag, Pb2+, Fe3+, Cu2+, Al3+, Mn2+, Ni2+, Ba

Make a qual scheme flow chart for the following Ions: Ag+, Mn2+, Cu2+, Fe3+, Ni2+, Pb2+,...

Make a qual scheme flow chart for the following Ions: Ag+, Mn2+, Cu2+, Fe3+, Ni2+, Pb2+, Ba2+, Al

Write the balanced equation in ACID solution for the reaction below: Fe2++MnO-4→Fe3++Mn2+

a. Write the balanced equation in ACID solution for the reaction below: Fe2++MnO-4→Fe3++Mn2+ b. To standardize a potassium permanganate solution (purple in appearance), a 0.250 g sample of FAS (iron II ammonium sulfate hexahydrate; molar mass = 342 g/mol) is dissolved in 25.00 mL distilled water, then acidified with sulfuric acid. The solution is then titrated with 35.00 mL potassium permanganate solution from a buret until a pale persistent purple color is attained. Calculate the molarity of the potassium...

1) What is the concentration of Fe3+ (after mixing but before reacting) in a solution made...

1) What is the concentration of Fe3+ (after mixing but before reacting) in a solution made with 2.73 mL of 0.0639 M Fe(NO3)3 and 3.89 mL of 0.0231 M KSCN? Please include units in your answer. 2) What is the concentration of a CV solution measured in a 1 cm cuvette with an absorbance of 0.559 and a molar absorptivity of 4560 M-1cm-1? Please include units in your answer. Report your answer in decimal format to three significant figures.

What is the pH of a solution in which 52 mL of 0.20M NaOH is added...

What is the pH of a solution in which 52 mL of 0.20M NaOH is added to 16 mL of 0.160M HCl?

Consider what is the pH of the solution when 25.0mL of 0.01M NaOH is added to...

Consider what is the pH of the solution when 25.0mL of 0.01M NaOH is added to 25.0mL of 0.01M acetic acid. Is it the same as in the case of HCl solution? What will the pH of the solution be if exactly 12.50mL of 0.01M NaOH solution is added to 25.0mL of 0.01M acetic acid solution?

What different types of inferences can be made from incidence and prevalence data?

What is the pH of a solution formed when 42.0mL of 0.120 M NaOH is added...

What is the pH of a solution formed when 42.0mL of 0.120 M NaOH is added to 50.0mL of 0.120 M CH3COOH? (Ka= 1.8x10^-5)

A 10.00 mL sample of a solution containing Fe3+ and Co2+ are added to 100 mL...

A 10.00 mL sample of a solution containing Fe3+ and Co2+ are added to 100 mL of pH 4.5 buffer and then titrated to a Cu-PAN endpoint with 17.62 mL of 0.05106 M EDTA. A 25.00 mL sample of the same solution are added to 100 mL of pH 4.5 buffer and then 10 mL of 1 M potassium fluoride are added to mask the Fe3+. This solution was titrated to a Cu-PAN endpoint with 12.44 mL of 0.05106 M...

Question