Question

what is the significance of the single vertical line and double vertical line in the formulation galvanic cell​

Answer 1

$\sf\large{\red{Significance \:of\:the\:single\:vertical}}$$\sf\large{\red{line\:and\:double\:vertical\:line:-}}$

• $\sf\green{A \:single\: vertical \:line\: placed\: between}$ $\sf\green{two\: phases \:in \:the \:galvanic \:cell}$ $\sf\green{ represents\: the\: phase\: boundary.}$ $\sf\green{ It\: indicates\: direct\: contact\: between\: them.}$

• $\sf\orange{A \:double \:vertical\: line\: placed\: between}$$\sf\orange{two\: solutions\: indicates\: that \:they\: are}$$\sf\orange{connected\: by\: salt\: bridge.}$

Answer 2

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=> A single vertical line ( | ) is drawn between two chemical species that are in different phases but in physical contact with each other (e.g., solid electrode | liquid with electrolyte ). A double vertical line ( || ) represents a salt bridge or porous membrane separating the individual half-cells.