Tollen’s reagent is used for the detection of aldehyde, when a solut

1.	Tollen’s reagent is used for the detection of aldehyde, when a solution of AgNO3 is added to glucose with NH4OH then gluconic acid is formed. Ag++e−→Ag; E∘red=0.8V C6H12O6+H2O→C6H12O7 (Gluconic acid) +2H++2e;E∘oxd=−0.05V [Ag(NH3)2]++e−→Ag(S)+2NH3;E∘red=–0.337V [Use 2.303×RTF=0.0592 and FRT=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?
Answer» 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?

Tollen’s reagent is used for the detection of aldehyde, when a solution of AgNO3 is added to glucose with NH4OH then gluconic acid is formed. Ag++e−→Ag; E∘red=0.8V C6H12O6+H2O→C6H12O7 (Gluconic acid) +2H++2e;E∘oxd=−0.05V [Ag(NH3)2]++e−→Ag(S)+2NH3;E∘red=–0.337V [Use 2.303×RTF=0.0592 and FRT=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?

Answer»

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?

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