Answer:
2. 110.
Explanation:
From the solubility curve, you can find that at 45°C to make a saturated solution of this salt, you should add 110 g of NaNO₃.
The dissolution of the solute in the solvent at the specified temperature is termed as solubility. The maximum solubility of sodium nitrate in the water at 45 degree Celsius in 110 grams.
The increase in temperature of the solvent resulted in the weaker the intermolecular force of solvent, and increases the solubility.
The solubility curve is drawn for the maximum amount of solute that can be dissolved in the solvent at the specified temperature.
From the solubility curve of sodium nitrate, the maximum amount of sodium nitrate in the water at 45 degree Celsius is 110 grams. Thus, option 2 is correct.
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