Answer Posted / qamaruddin

25%AMMONIA MEANS 25g in 100 ml.
above solution 0.25g/ml or 250mg/ml.
250mg of 25% ammonia solution in 100ml=2.5mg/ml
and dilute 2ml(2.5mg/ml sol)in 100ml = 0.05mg/ml.
0.05mg/ml is equal to 50ppm.

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