BE THE FIRST TO BE BRAINLIESTwhy is the water level not rising when sugar or salt is added to it? in addition to that why does the water level rises when we add salt or sugar to the saturated solution??
Answers
If salt dissolves in water to make a saturated solution there is about a 2.5% reduction in volume. This is due to hydration of the ions by the water molecules.
Referring specifically to sodium chloride as "salt", observations show densities to be higher than expected if there was no volume change (i.e. the volume of the pure solvent summed with the volume of the pure salt). This indicates that the volume decreases with the addition of salt.
This may not be true for all salts. What we are looking at here are partial molar properties, specifically Partial Molar Volume. This is (in basic terms) the volume contribution of an individual component to the total volume of a mixture or solution. This changes with the concentration of the component and with a number of other factors (temperature, pressure and the concentration of other components).
It arises because of interactions between the different molecules. Sometimes this causes volume contraction, sometimes expansion. There are some pretty complicated models that look at predicting this.