The presence of magnesium ion was found to be a major cause of destabilization of natural rubber(NR)latex.KThe magnesium content in latex is then treated by precipitation process kby hadding diammonium hydrogen phosphatek(DAHP) that could adversely affect the physical properties of dipped products made of NR latex. Mg – EDTA mercury electrode was developed as indicating electrode for to be used complexometric titration.With this electrode, potentiometric titration of magnesium in latex can be performed with titration jumps that originate from a change in Mg2+ ion activity and monitored.