SATHEE: Redox Reactions And Electrochemistry Ques 738

Redox Reactions And Electrochemistry Ques 738

Question: For the cell $P t | H_{2} (g) |$ solution $X | | K C I$ (saturated) $| H g_{2} C l_{2} | H g |, P t$ the observed EMF at $25^{\circ} C$ was $600 m V .$ When solution X was replaced by a standard phosphate buffer with $p H = 7.00,$ the EMF was $777 m V$ . Find the pH of solution X.

Options:

A) 3

B) 4

C) 5

D) 6

Show Answer

Answer:

Correct Answer: B

Solution:

[b] $H_{2} \overset{}{\to} 2 H^{+} + 2 e^{-}$ $\frac{H g_{2} C l_{2} + 2 e^{-} \overset{}{\to} 2 H g + 2 C l^{-}}{H_{2} + H g_{2} C l_{2} \overset{}{\to} 2 H^{+} + 2 C l^{-} + 2 H g}$ $E_{i n i t i a l} = E^{\circ} + \frac{0.059}{2} \log \frac{1}{{[H^{+}]}^{2}, {[C l^{-}]}^{2}} = 0.6$ $E_{f i n a l} = E^{\circ} + \frac{0.059}{2} \log \frac{1}{{(10^{- 7})}^{2}, {[C l^{-}]}^{2}} = 0.777$ subtracting we get $0.177 = 0.059 \log \frac{[H^{+}]}{10^{- 7}}$

$\Rightarrow$ $\frac{[H^{+}]}{10^{- 7}} = 1000$

$\Rightarrow$ $[H^{+}] = 10^{- 4}$
$\Rightarrow p H = 4.$

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Redox Reactions And Electrochemistry Ques 738

Question: For the cell Pt|H2(g)| solution X||KCI (saturated) |Hg2Cl2|Hg|,Pt the observed EMF at 25∘C was 600mV. When solution X was replaced by a standard phosphate buffer with pH=7.00, the EMF was 777mV . Find the pH of solution X.

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Question: For the cell $P t | H_{2} (g) |$ solution $X | | K C I$ (saturated) $| H g_{2} C l_{2} | H g |, P t$ the observed EMF at $25^{\circ} C$ was $600 m V .$ When solution X was replaced by a standard phosphate buffer with $p H = 7.00,$ the EMF was $777 m V$ . Find the pH of solution X.