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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Potassium Trioxonitrate (V) known as KNO\(_3\) and Sodium Trioxonitrate (V) known as NaNO\(_3\) , the point of intersection of this two compound on the solubility graph is traced downward to the temperature axis and the result gives 45 \(^o\)C