what are universal indicator
Write the formula of complex salt.
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Ph scale is universal indicator
NaCl
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=> Universal indicator is a homogenous mixture which is prepared by mixing some common indicators. It has pH ranging from 1-14 to indicate acidity or alkalinity of solutions.
A complex salt is a salt that contains one or more complex ions.
Ferric Alum [K2S04. Fe2 (SO4)3. 24 H20]
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