Chapter 2: Q72P (page 40)

A concentration cell consists of two H2/H half-cells. Half cell A has H2 $0.95$ atm bubbling into $0.10$ M HCl. Half-cell B has H2 at $0.60$ atm bubbling into $2.0$ M HCl. Which half-cell houses the anode? What is the voltage of the cell?

Short Answer

Expert verified

Anode: Half cell A

_{$E_{c e l l} = 0.0385 V$}

Step by step solution

To find the voltage of the cell

Half cell A: $2 H + 2 e^{-} \to H_{2} (O . 95 a t m, 0.10 M H C I)$

Half cell B: $2 H^{+} + 2 e^{-} \to H_{2} (0.60 a t m, 2.0 M H C I)$

Oxidation takes place at anode, it has a negative charge. Therefore, electrode A is negative and electrode B is positive.

In a concentration cell, the anode half-cell contains the more dilute solution, which is the solution in half-cell A.

Hence, we get the following cell reactions:

Anode: $H_{2} \to 2 H^{ϕ} + 2 e^{-}; (0.95 a t m, 0, 10 M H C I)$

Cathode: $2 H^{+} 2 e^{-} \to H_{2}; (0.60 a t m, 2, 0 N H C I)$

Cell reaction: $H^{+} (a q; 2.0 M) [h a l f c e l l B $] \to H^{+} [(a q; 0.10 M) / h a l f c e l l A]$

$E_{c e l l} = E_{c e l l} - \frac{0.0592}{n} \log Q^{\circ} = 0 - \frac{0.0592}{2} \log \frac{0.01 M}{2.0 M} = - \frac{0.0592}{2} \times (- 2.3) = 0.0385 V$

Hence Anode: Half cell A

$E_{c e l l} = 0.0385 V$

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A concentration cell consists of two H2/H half-cells. Half cell A has H2 $0.95$ atm bubbling into $0.10$ M HCl. Half-cell B has H2 at $0.60$ atm bubbling into $2.0$ M HCl. Which half-cell houses the anode? What is the voltage of the cell?

Short Answer

Step by step solution

To find the voltage of the cell

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A concentration cell consists of two H2/H half-cells. Half cell A has H2 0.95atm bubbling into 0.10M HCl. Half-cell B has H2 at0.60atm bubbling into2.0M HCl. Which half-cell houses the anode? What is the voltage of the cell?

Short Answer

Step by step solution

To find the voltage of the cell

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Organic Chemistry

The Earths Atmosphere

Chemical Analysis

Inorganic Chemistry

Physical Chemistry

Chemical Reactions

Study anywhere. Anytime. Across all devices.

A concentration cell consists of two H2/H half-cells. Half cell A has H2 $0.95$ atm bubbling into $0.10$ M HCl. Half-cell B has H2 at $0.60$ atm bubbling into $2.0$ M HCl. Which half-cell houses the anode? What is the voltage of the cell?