why was the test tube only half-filled with water?
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the test tube only half-filled with water as there might be any other substance which is to be poured in it
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Ammonium chloride is salt, and when we add solid salt into water, it's dissolved and nothing happens. The only thing happens when any salt dissolved in water, is becoming its ions and improve its conductivity. Just remember, that NH4+ is a weak acid, so the dissociation reaction doesn't go far to the right.
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