If 20g of sodium chloride is dissolved in 100 cm3 of water at 20c is the solution saturated?
I looked up the solubility of NaCl in my copy of The Merck Index and it is listed as 1 gram NaCl dissolving in 2.8 mL water at 25 degrees C. Converting that means that 35.7 g NaCl should dissolve in 100 cc at 25 degrees C. I don't have the solubility for 20 degrees C and I didn't find it listed on the Internet; however, my guess is that 20 g/100 cc would not be saturated.
To determine whether a solution is saturated, you need to compare the amount of solute dissolved to the maximum amount that can dissolve at a given temperature.
In this case, you have 20g of sodium chloride (NaCl) dissolved in 100 cm3 (which is equivalent to 100 mL) of water at 20°C. To find out if it is saturated, we need to compare this to the solubility of NaCl at 20°C.
Unfortunately, you mentioned that you couldn't find the solubility of NaCl at 20°C. However, you did find the solubility at 25°C. While 25°C is close to 20°C, temperature can affect the solubility of a substance. As such, we can't directly use the solubility at 25°C to determine the saturation at 20°C.
To get a more accurate answer, you'll need to find the solubility of NaCl at 20°C. One way to find this information is by referring to a reliable source such as a chemistry textbook or scientific database. These sources often provide tables or graphs indicating the solubility of various substances at different temperatures.
Once you have the solubility at 20°C, you can compare it to the amount of NaCl dissolved in your solution. If the amount of NaCl dissolved is less than the solubility at 20°C, then the solution is not saturated. If it is equal to or greater than the solubility, then the solution is saturated.
Remember, it's important to rely on accurate and specific data when determining the saturation of a solution.