#2. An unsaturated solution will become more concentrated if you add more solute. Decreasing the total volume of water in the solution also increases the
solution's concentration. Consider a solution made by dissolving 20 g KCI in
100 g of water at 40 C.
A. Draw a model of this solution
B. Suppose that while the solution was kept at 40 C, one-fourth of the water
evaporated
i. Draw a model of this final solution and describe how it differs from
your model of the original solution
ii. How much water must evaporate at this temperature to create a
saturated solution?

and

Explanation:

you should do it

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

there are two significant figures.