Upon addition of sugar to water, what happens to the vapor pressure of water?

Question

does it increase, decrease, stay the same?

Answer 1

When vaporized, water vapor does not contain any impurities that the liquid water contains. So the sugar is left in the liquid. This means that water vapor pressure depends only on the volume, pressure and temperature.

But if you consider the closed system, when you boil water to get vapor and then measure the pressure, the more impurities the water has dissolved, the higher the temperature it boils at. So if you add sugar to water, you will have to apply more energy to get the same amount of vapor as in the case when using water without sugar.

Answer 2

increase