A volume of x mL of 5 M solution was mixed with 10 mL of 2 M solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV, then the value of x = __________ m

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Solution

Q.
A volume of x mL of 5 M $N a H C O ₃$ solution was mixed with 10 mL of 2 M $H ₂ C O ₃$ solution to make an electrolytic buffer. If the same buffer was used in the following electrochemical cell to record a cell potential of 235.3 mV, then the value of x = __________ mL (nearest integer).

$Sn (s) | Sn {(OH)}_{6}^{2 -} (0.5 M) | {HSnO}_{2}^{-} (0.05 M) | {OH}^{-} | {Bi}_{2} O_{3} (s) | Bi (s)$

Consider upto one place of decimal for intermediate calculations [2026]

Given:

$[\begin{matrix} E_{{HSnO}_{2}^{-} | Sn {(OH)}_{6}^{2 -}}^{\circ} = - 0.9 V \\ E_{{Bi}_{2} O_{3} | Bi}^{\circ} = - 0.44 V \\ p K a_{(H_{2} {CO}_{3})} = 6.11 \\ \frac{2.303 R T}{F} = 0.059 V \\ Antilog (1.29) = 19.5 \end{matrix}]$

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