If 50.0 g of NaCl is mixed with 100.0 g of water at 80.0 °C, how much will not dissolve?
I don't have the solubility tables of thousands of compounds memorized. I look on the web and I see that about 40 g NaCl in 100 g H2O @ 80 C is a saturated solution; therefore, about 10 g NaCl will be left over if you start with 50 g NaCl. You could have looked this up on the web as I did.
To determine how much of NaCl will not dissolve in water, we need to know the solubility of NaCl at 80.0 °C. The solubility of NaCl increases with temperature, so it is important to find the value specific to 80.0 °C.
To find the solubility of NaCl at 80.0 °C, you can refer to a solubility table or use a scientific source. Once you have determined the solubility of NaCl at 80.0 °C, you can compare it to the amount of NaCl provided (50.0 g).
If the solubility of NaCl at 80.0 °C is higher than the amount of NaCl (50.0 g), then all of it will dissolve in the water, and none will be left undissolved.
However, if the solubility of NaCl at 80.0 °C is lower than the amount of NaCl (50.0 g), then there will be some NaCl that will not dissolve.
In this case, you would need to subtract the solubility of NaCl at 80.0 °C from the amount of NaCl (50.0 g) to find the amount that will not dissolve.
It is important to note that the solubility of NaCl can also be affected by other factors such as pressure and the presence of other solutes.
To determine how much NaCl will not dissolve in the water, we need to compare the solubility of NaCl at different temperatures.
1. Find the solubility of NaCl at 80.0 °C:
- According to the solubility chart, the solubility of NaCl in water at 80.0 °C is approximately 38.8 g/100 g of water.
2. Calculate the maximum amount of NaCl that can dissolve in 100.0 g of water at 80.0 °C:
- The maximum amount of NaCl that can dissolve in 100.0 g of water at this temperature is (38.8 g/100 g) * 100 g = 38.8 g.
3. Determine the excess amount of NaCl:
- The initial amount of NaCl added is 50.0 g.
- If the maximum amount that can dissolve is only 38.8 g, the excess amount that will not dissolve is 50.0 g - 38.8 g = 11.2 g.
Therefore, 11.2 g of NaCl will not dissolve in the water at 80.0 °C.