= Supporting electrolyte
A <supporting electrolyte> is an electrolyte added at a concentration high compared with that of the electroactive analyte. Its ions carry much of the solution <electric current>, reducing the electric-field-driven migration of the analyte.
The chosen electrolyte should not undergo appreciable interfering electrode reactions in the potential range being studied. It still affects ionic strength and interfacial conditions, so supporting-electrolyte identity is part of an electrochemical measurement's conditions.
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