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How can samples above 1M in ammonia concentration be measured using ammonia electrode?

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How can samples above 1M in ammonia concentration be measured using ammonia electrode?

(a) It must be diluted and measured

(b) It cannot be measured

(c) The electrode has to be modified for measuring

(d) It can be measured directly

The question was asked in my homework.

Enquiry is from Ammonia and Fluoride Electrode in division pH Meters and Ion Analysers of Analytical Instrumentation

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The correct answer is (a) It must be diluted and measured

Easy explanation: Samples above 1M in ammonia concentration be measured by diluting the solution. Samples having concentrations below that can be measured directly.

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