Question

Enter electrons as e-.

Use smallest possible integer coefficients for ALL reactions.

If a box is not needed, leave it blank.

A voltaic electrochemical cell is constructed in which the anode is a Cr³⁺Cr half cell and the cathode is a Fe²⁺Fe half cell. The half-cell compartments are connected by a salt bridge.

Write the anode reaction.

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Write the cathode reaction.

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Write the net cell reaction.

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In the external circuit, electrons migrate _____from/to the Cr³⁺Cr electrode _____from/to the Fe²⁺Fe electrode.

In the salt bridge, anions migrate _____from/to the Fe²⁺Fe compartment _____from/to the Cr³⁺Cr compartment.

Answer 1

The electrons ALWAYS travel through the external circuit from the anode to the cathode (the alphabetic direction a → c).

In the external circuit, electrons migrate from the Cr3+Cr electrode to the Fe2+Fe electrode.

In the salt bridge, negatively charged ions, anions move from the cathode solution to the anode solution.

In the salt bridge, anions migrate from the Fe2+Fe compartment to the Cr3+Cr compartment.

At Anode - oxidation takes place. cle Couls) -cont3 + [email protected] Cathode, reduction takes place Fet2 +2e fers) ... X 3 At Net reaction. 2 Ca(s) + 3 Fetrag) 2 Cat3(aq) + 3 Fecs)