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Oxidation States

Tollen's reag...

Question

Tollen’s reagent is used for the detection of aldehyde, when a solution of $A g N O_{3}$ is added to glucose with $N H_{4} O H$ then gluconic acid is formed.

$A g^{+} + e^{-} \to A g;$ $E_{r e d}^{\circ} = 0.8 V$

$C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7}$ (Gluconic acid) $+ 2 H^{+} + 2 e; E_{o x d}^{\circ} = - 0.05 V$

$A g (N H_{3})_{2}^{+} + e^{-} \to A g (S) + 2 N H_{3}; E^{\circ} = - 0.337 V$

[Use $2.303 \times \frac{R T}{F} = 0.0592$ and $\frac{F}{R T} = 38.92$ at 298 K]

(i) $2 A g^{+} + C_{6} H_{12} O_{6} + H_{2} O \to 2 A g (s) + C_{6} H_{12} O_{7} + 2 H^{+}$ . Find ln K of this reaction.

A

66.21

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B

58.38

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C

28.30

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D

46.29

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Solution

The correct option is B
58.38

$2 A g^{+} + 2 e \to 2 A g$ $Δ G = - 2 F \times 0.8$ (reduction half)

$\frac{C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{1} 2 O_{7} + 2 H^{+} + 2 e Δ G = - 2 F \times (- 0.05) (o x i d a t i o n h a l f)}{2 A g^{+} + C_{6} H_{12} O_{6} + H_{2} O \to 2 A g + C_{6} H_{12} O_{7} + 2 H^{+} Δ G^{0} = - 1.5 F}$

$Δ G^{0} = - R T l n K$

$- 1.5 \times F = - R T l n K$

$\frac{F}{R T} = 38.92$ at 298 K

$l n K = 1.5 \times 38.92 \approx 58.32$

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Similar questions

Q. Tollen's reagent is used for the detection of aldehydes. When a solution of

A g N O_{3}

is added to glucose with

N H_{4} O H

, then gluconic acid is formed.

A g^{+} + e^{-} \to A g; E_{r e d}^{o} = 0.80 V

C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7} + 2 H^{+} + 2 e^{-}; E_{o x i}^{o} = - 0.05 V

A g (N H_{3})_{2}^{+} + e^{-} \to A g (s) + 2 N H_{3}; E_{r e d}^{o} = 0.337 V

log K

of the reaction?

2 A g^{+} + C_{6} H_{12} O_{6} + H_{2} O \to 2 A g (s) + C_{6} H_{12} O_{7} + 2 H^{+}

(Take : 2.303 \times \frac{R T}{F} = 0.06 at 298 K)

Q. Tollen's reagent is used for the detection of aldehydes. When a solution of

A g N O_{3}

is added to glucose with

N H_{4} O H

, then gluconic acid is formed.

A g^{+} + e^{-} \to A g; E_{r e d}^{o} = 0.80 V

C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7} + 2 H^{+} + 2 e^{-}; E_{o x i}^{o} = - 0.05 V

A g (N H_{3})_{2}^{+} + e^{-} \to A g (s) + 2 N H_{3}; E_{r e d}^{o} = 0.337 V

log K

of the reaction?

2 A g^{+} + C_{6} H_{12} O_{6} + H_{2} O \to 2 A g (s) + C_{6} H_{12} O_{7} + 2 H^{+}

(Take : 2.303 \times \frac{R T}{F} = 0.06 at 298 K)

Q. Tollen's reagent is used for the detection of aldehyde when a solution of

A g {N O}_{3}

is added to glucose with

{N H}_{4} O H

then fluconic acid is formced

{A g}^{+} + e^{-} \to A g

;

E_{r e d}^{o} = 0.8 V

C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7}

(Gluconic acid)

+ 2 H^{+} + 2 e^{-}

E_{r e d}^{o} = - 0.05 V

A g {({N H}_{3})}_{2} + e^{-} \to A g (s) + 2 {N H}_{3}

2.202 \times \frac{R T}{F} = 0.0592

\frac{F}{R T} = 38.92

298 K

)

2 {A g}^{+} + C_{6} H_{22} O_{6} + H_{2} O \to 2 A g (s) + C_{6} H_{212} O_{7} + 2 H^{+}

ln K

of this reaction?

Tollen’s reagent is used for the detection of aldehyde, when a solution of $A g N O_{3}$ is added to glucose with $N H_{4} O H$ then gluconic acid is formed.

$A g^{+} + e^{-} \to A g;$ $E_{r e d}^{\circ} = 0.8 V$

$C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7}$ (Gluconic acid) $+ 2 H^{+} + 2 e; E_{o x d}^{\circ} = - 0.05 V$

$[A g (N H_{3})_{2}]^{+} + e^{-} \to A g (S) + 2 N H_{3}; E_{r e d}^{\circ} = - 0.337 V$

[Use $2.303 \times \frac{R T}{F} = 0.0592$ and $\frac{F}{R T} = 38.92$ at 298 K]

(ii) When ammonia is added to the solution, pH is raised to 11. Which half-cell reaction is affected by pH and by how much?

Q. Tollen's reagent is used for the detection of aldehydes. When a solution of

A g N O_{3}

is added to glucose with

N H_{4} O H

, then gluconic acid is formed.

A g^{+} + e^{-} \to A g; E_{r e d}^{o} = 0.80 V

C_{6} H_{12} O_{6} + H_{2} O \to C_{6} H_{12} O_{7} + 2 H^{+} + 2 e^{-}; E_{o x i}^{o} = - 0.05 V

A g (N H_{3})_{2}^{+} + e^{-} \to A g (s) + 2 N H_{3}; E_{r e d}^{o} = 0.337 V

(Take : 2.303 \times \frac{R T}{F} = 0.06 at 298 K)

When ammonia is added to the solution,

p H

is raised to 11. Which half-cell reaction is affected by

p H

and by how much?

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