Why added NH4OH to isopropylalcohol in determination H2S&RSH in liquid hydrocarbon(UOP-163) in potentiometric with AgNO3?
AgNO3 + 2NH3 = [Ag(NH3)2]NO3.
The ammonia is added to couple the silver cations into a complex and thus avoid side reactions such as precipitation of silver chloride. Therefore it is used to increase the measurement accuracy.
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