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Solutions (solubility): Which of the following substances is the most soluble in water at room temperature? Compare typical solubilities of common salts. Choose the correct substance.

Difficulty: Easy

Ammonium nitrate (NH₄NO₃)
Potassium nitrate (KNO₃)
Sodium chloride (NaCl)
Calcium carbonate (CaCO₃)

Correct Answer: Ammonium nitrate (NH₄NO₃)

Explanation:

Given data

Ask: Most water-soluble substance among common salts.

Concept/Approach
At ~20–25 °C, ammonium nitrate has an exceptionally high solubility (well over 100 g per 100 g water), higher than KNO₃ (~30–35 g/100 g water) and NaCl (~36 g/100 g water). CaCO₃ is sparingly soluble.

Final Answer
Ammonium nitrate (NH₄NO₃)

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