Question

The solubility level of an aqueous solution of NaCl at 25°C is:

• A. 20g
• B. 36g
• C. 95g
• D. 8g

Hint:

Solubility is the maximum amount of solute that can dissolve in a solvent at a given temperature, which for NaCl at 25°C is 36g per 100g of water.

Answer 1

The Correct Option is B

The solubility level of an aqueous solution of NaCl at 25°C is: 

• Option 1: 20g - This is lower than the actual solubility of NaCl at 25°C.
• Option 2: 36g - This is the correct answer. Sodium chloride (NaCl) has a solubility of approximately 36 grams in 100 milliliters of water at 25°C.
• Option 3: 95g - This is too high for the solubility of NaCl at 25°C. NaCl does not dissolve at this high concentration in water at this temperature.
• Option 4: 8g - This is far too low for the solubility of NaCl in water at 25°C.

Explanation:

The solubility of NaCl (sodium chloride) in water at 25°C is approximately 36g per 100mL of water. This is the correct answer as it reflects the typical solubility of NaCl under normal conditions at this temperature.

Answer 2

This question asks how many grams of NaCl dissolve in a fixed amount of water, typically 100 mL, at 25°C. Check each option against the real solubility behavior of common table salt.

1. 20g: this is noticeably lower than how much salt actually dissolves in this amount of water at room temperature, so it undershoots the real value.
2. 36g: sodium chloride is well known to dissolve up to about this amount in 100 mL of water at 25°C, a solubility figure commonly quoted in chemistry references. This matches the known behavior of table salt.
3. 95g: this is far higher than salt's real solubility at this temperature; a solute would need to be far more soluble than NaCl to reach this figure.
4. 8g: this is much too low, well under what even a fairly weak stir of salt water in a kitchen easily dissolves.

NaCl's known solubility in water at room temperature sits at about 36 grams per 100 mL.

So the correct answer is 36g.