What is the potential of zinc anodes used in cathodic protection?

Zinc anodes are commonly used in cathodic protection systems to prevent corrosion in metals, particularly in marine environments. The corrosion potential of zinc anodes typically ranges around -1.10 volts when measured against a standard copper/copper sulfate reference electrode. This potential is effective in providing sufficient driving force for cathodic protection, thereby ensuring that the structure being protected, such as pipelines or ship hulls, remains at a more noble potential than the zinc anode.

This potential allows zinc to corrode preferentially, sacrificing itself to protect the more critical metal components from corrosion. The choice of -1.10 volts aligns with the established electrochemical properties of zinc, making it the correct answer for this question.

Other potential values, such as -0.90 volts, -1.30 volts, and -1.50 volts, do not reflect the standard potential for zinc anodes. Each of these values may correspond to different materials or cathodic protection systems but do not accurately represent the potential specifically associated with zinc anodes.