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Question
Consider the following salt:
NH4X
If in salt NH4X, X is nitrate, then its solution will give what colour with a universal indicator? Why?
Solution
If X is a nitrate in salt NH4X, its solution will be green with a universal indicator. This is because ammonium ion \[\ce{(NH^+4)}\] is a weak acid that can partially dissociate in the solution to form hydrogen ions (H+), making the solution acidic. The ion nitrate \[\ce{(NO^-3)}\] is a neutral ion that has no effect on pH. The solution's green colour indicates a pH between 7 and 6.
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