Why is `KNO_(3)` used in salt-bridge?

A salt bridge

A salt bridge

Assertion : Insert electrolytes like KCl, KNO_(3) are used in salt bridge. Reason : Salt bridge provides an electric contact between the two solutions without allowing them to mix with each other.

Why is salt-bridge used?

A standard solution of KNO_(3) is used to make salt bridge, because

A standard solution of KNO_(3) is used to make salt bridge, because