a) A student is required to construct a battery in the form of a galvanic cell using nickel (II) nitrate and cadmium (II
Posted: Mon May 02, 2022 7:47 pm
a) A student is required to construct a battery in the form of a
galvanic cell using nickel (II) nitrate and cadmium (II) nitrate.
Given that a 0.75 M solution of nickel (II) nitrate must be used,
what concentration of cadmium nitrate is required to achieve a cell
voltage of 0.12 V at 25 ℃?
Ni2+(aq) +
2e- --> Ni(s)
Eored = - 0.40 V
Cd2+(aq) +
2e- --> Cd(s)
Eored = - 0.26 V
b) Solvent extraction is being used by a student to separate a
naturally occurring triprotic acid, H3A (25g/L) from an
organic solution. The procedure involved shaking 75 mL of the
solution with 100 mL of water and allowing the mixture to
equilibrate in a separatory funnel. The aqueous phase was then
titrated in triplicate with 1 M NaOH for which the following titre
values were obtained: 14.40 mL, 12.00 mL, 12.10 mL. Calculate the
partition coefficient of H3A between the organic solvent
and water. Molar mass of the triprotic acid = 321.7 g/mol
galvanic cell using nickel (II) nitrate and cadmium (II) nitrate.
Given that a 0.75 M solution of nickel (II) nitrate must be used,
what concentration of cadmium nitrate is required to achieve a cell
voltage of 0.12 V at 25 ℃?
Ni2+(aq) +
2e- --> Ni(s)
Eored = - 0.40 V
Cd2+(aq) +
2e- --> Cd(s)
Eored = - 0.26 V
b) Solvent extraction is being used by a student to separate a
naturally occurring triprotic acid, H3A (25g/L) from an
organic solution. The procedure involved shaking 75 mL of the
solution with 100 mL of water and allowing the mixture to
equilibrate in a separatory funnel. The aqueous phase was then
titrated in triplicate with 1 M NaOH for which the following titre
values were obtained: 14.40 mL, 12.00 mL, 12.10 mL. Calculate the
partition coefficient of H3A between the organic solvent
and water. Molar mass of the triprotic acid = 321.7 g/mol