In the construction of a calomel electrode, the KCl solution must be saturated with calomel . What does this mean?

C a l o m e l e l e c t r o d e a c t s a s a r e f e r e n c e e l e c t r o d e . C a l o m e l e l e c t r o d e c o n s i s t s o f a H g a n d H g C l_{2} s o l u t i o n . C o m p a r e d t o S \tan d a r d h y d r o g e n e l e c t r o d e t h i s c a l o m e l e l e c t r o d e i s e a s y t o m a i n t a i n . H e r e t h e p a s t e o f H g C l_{2} a n d s o l i d H g a t t a c h e d t o a r o d i s i m m e r s e d i n s a t u r a t e d K C l s o l u t i o n . S a t u r a t e d s o l u t i o n o f K C l a l l o w s t h e e x c h a n g e o f i o n s t h r o u g h a p o r o u s s a l t b r i d g e, w h i c h i s u s e d t o c o m p l e t e t h e c i r c u i t . \frac{1}{2} H g C l_{2} + e^{-} \leftrightarrow H g + C l^{-}

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