According to the solubility curve, the solubility of NaCl is 40 g in 100 g of water at 90^circ C Which solution below is saturated? 80 g NaCl in 300 g water 85 g NaCl in 200 g water 30 g NaCl in 100 g water 10 g NaCl in 50 g water

To determine which solution is saturated, we need to compare the amount of NaCl in each solution to the solubility of NaCl at the given temperature.<br /><br />Given information:<br />- The solubility of NaCl is 40 g in 100 g of water at 90°C.<br /><br />Let's analyze each solution:<br /><br />1. 80 g NaCl in 300 g water:<br /> - Solubility at 90°C: 40 g NaCl / 100 g water = 0.4 g NaCl / g water<br /> - Amount of NaCl: 80 g / 300 g water = 0.267 g NaCl / g water<br /> - This solution is unsaturated, as the amount of NaCl is less than the solubility.<br /><br />2. 85 g NaCl in 200 g water:<br /> - Solubility at 90°C: 40 g NaCl / 100 g water = 0.4 g NaCl / g water<br /> - Amount of NaCl: 85 g / 200 g water = 0.425 g NaCl / g water<br /> - This solution is saturated, as the amount of NaCl is equal to the solubility.<br /><br />3. 30 g NaCl in 100 g water:<br /> - Solubility at 90°C: 40 g NaCl / 100 g water = 0.4 g NaCl / g water<br /> - Amount of NaCl: 30 g / 100 g water = 0.3 g NaCl / g water<br /> - This solution is unsaturated, as the amount of NaCl is less than the solubility.<br /><br />4. 10 g NaCl in 50 g water:<br /> - Solubility at 90°C: 40 g NaCl / 100 g water = 0.4 g NaCl / g water<br /> - Amount of NaCl: 10 g / 50 g water = 0.2 g NaCl / g water<br /> - This solution is unsaturated, as the amount of NaCl is less than the solubility.<br /><br />Therefore, the solution that is saturated is the one with 85 g NaCl in 200 g water.