Question

If sodium chloride has a solubility of 46.0 g of sodium chloride in 100g of water at 20°C, how many grams of water are needed to prepare a saturated solution containing 205 g of sodium chloride?

a) 250 g
b) 300 g
c) 400 g
d) 500 g

Answer 1

To prepare a saturated NaCl solution at 20°C with 205 g of NaCl (with solubility 36 g per 100 g water), approximately 568.89 g of water are needed; not matching any of the answer choices provided, indicating a possible error.

Step-by-step explanation:

To prepare a saturated solution containing 205 g of sodium chloride at 20°C where the solubility of sodium chloride (NaCl) is 36.0 g per 100 g of water, we first calculate the amount of water needed using proportions. Based on the solubility, if 36 g of NaCl dissolve in 100 g of water, then 205 g would need:

(205 g NaCl) × (100 g water / 36 g NaCl) = 568.89 g water

Therefore, to prepare a saturated solution containing 205 g of NaCl, we need approximately 568.89 g of water. This amount is not available in the choices provided, which suggests there might be an error in the question's data or choices offered.