A solution of silver nitrate was stirred with iron rod. Will it cause any change in the concentration of silver and nitrate ions? E o Fe 2+/Fe = -0.44V ; E o Ag + /Ag = +0.80V

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Solution

Dear Student,

$A s p e r q u e s t i o n s t a t e m e n t t h e m i x i n g o f s i l v e r n i t r a t e w i t h i r o n r o d m a k e s a c h a n g e i n c o n c e n t r a t i o n c h a n g e f o r A g^{+} i o n i t d e c r e a s e s b u t h a v e n o i n f l u e n c e o n N {O_{3}}^{-} i o n s h e n c e n o c h a n g e s e e m e d w i t h i t . T h e r e a c t i o n s c h e m e i s, 2 A g^{+} + F e \to 2 A g + F e^{2 +} b y u \sin g g i v e n d a t a o f E (c e l l) w e g e t, E_{r e d} = + 0.80 V E_{o x i d} = - 0.44 V E_{c e l l} = + 0.80 - 0.44 = 0.36 V$
Regards.

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Q. In which metal container, the aqueous solution of

C u {S O}_{4}

can be stored?

E_{{C u}^{2 +} / C u}^{o} = 0.34 V

E_{{F e / F e}^{2 +}}^{o} = 0.44 V, E_{{A l / A l}^{3 +}}^{o} = 1.66 V

E_{N i / {N i}^{2 +}}^{o} = 0.25 V, E_{{A g}^{+} / A g}^{o} = 0.80 V

Q. (a) A solution of silver nitrate is a good electrolyte but it is not used for electroplating an article with silver.
(b) Identify the following reactions as either oxidation or reduction:
(i) O + 2e⁻

\overset{}{\to}

O²⁻
(ii) K − e⁻

\overset{}{\to}

K⁺
(iii) Fe³⁺ + e⁻

\overset{}{\to}

Fe²⁺

Q. At equimolar concentrations of

F e^{2 +}

and

F e^{3 +}

, what must [

A g^{+}

] be so that the voltage of the galvanic cell made from the (

A g^{+} | A g)

and (

F e^{3 +} | F e^{2 +})

electrodes equals zero ?

F e^{2 +} + A g^{+} ⇌ F e^{3 +} + A g

E_{A g^{o} | A g}^{o} = 0.7991; E_{F e^{3 +} | F e^{2 -}}^{o} = 0.771

Q. The number of

{A g}^{+}

ion in one drop of silver nitrate solution is:

$E_{F e^{2 +} / F e}^{\circ} = - 0.44 V, E_{C u^{2 +} / C u}^{\circ} = 0.34 V, E_{A g^{2 +} / g}^{\circ} = 0.80 V$ . Will Fe displace Cu from $C u S O_{4}$ solution? Will Ag displace Cu from $C u S O_{4}$ solution?

1. Yes, Yes

2. No, No

3. Yes, No

4. No, Yes

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