Question

If 45 grams of NaNO3 is dissolved in 100 grams of water at 40 C, how much more is needed to have a saturated solution?

Answer 1

I literally have no idea

Answer 2

You would need to add approximately 57 grams more of
`NaNO_3` to have a saturated solution at 40°C.

The solubility of sodium nitrate (
`NaNO_3`) at 40°C is approximately 102 g per 100 g of water.

If you have already dissolved 45 g of NaNO3 in 100 g of water, the amount of
`NaNO_3` you would need to add to reach saturation at 40°C would be:

`$$102 \text{ g} - 45 \text{ g} = 57 \text{ g}$$`

So, you would need to add approximately 57 grams more of
`NaNO_3` to have a saturated solution at 40°C.