Do the different pH levels of water affect their rate of evaporation?

Question

By pH levels of water I mean acid (under 7), neutral (7), and base (above 7). I am doing a science project and I really need help!

Answer 1

The factors that effect evaporation are temperature(the faster the molecules are moving the more likely they are to escape into the gaseous phase), surface area to evaporate from and air blowing over the surface making new area that is not saturated above. If the environment is very dry more will evaporate. If the air is saturated little will evaporate. What is dissolved makes no difference as it stays behind.

Answer 2

It would depend on whether the chemicals responsible for the pH change were acting as surfactants or not. A surfactant is anything that disrupts the hydrogen bonds that cause surface tension to be so high and the vapor pressure for water to be so low. If you raised the vapor pressure by a surfactant, you would increase the evaporation rate. As soaps are surfactants and they tend to be slightly alkaline, you would see a correspondence in increased evaporation with an increased pH. But it might be the opposite for the pH if the surfactant were acidic.

Answer 3

Unless you go to extreme pHs, I wouldn't think that they would evaporate at different rates. Only when you dissolve a lot of stuff in water will the vapor pressure (and so the rate of evaporation) be affected much at all...

Answer 4

Ph itself doesn't. If the disolved solids are high enough, that will slow evaporation by reducing the vapor pressure.