Answer :
Final answer:
At 20°C, approximately 139.3 g of water is needed to dissolve 50 g of NaCl.
Explanation:
The solubility of NaCl in water is affected by temperature. As the temperature increases, the solubility of NaCl also increases. The given solubility of 35.9 g at 20°C means that 35.9 g of NaCl can dissolve in 100 g of water at that temperature. To calculate how much water is needed to dissolve 50 g of NaCl, we can use the proportion:
(35.9 g NaCl) / (100 g water) = (50 g NaCl) / (x g water)
Cross-multiplying and solving for x, we find that approximately 139.3 g of water is needed to dissolve 50 g of NaCl at 20°C.
Learn more about NaCl solubility here:
https://brainly.com/question/30642055
#SPJ11