You are given three beakers of unknown liquids. one beaker contains pure water. one contains salt water. one contains sugar water. without tasting the liquids, how could you identify the liquid in each beaker?

The density and electrical conductivity of the solutions can be measured

Explanation:

We could get three beakers and measure the mass of the solution by subtracting the mass of the beaker from mass of solution + beaker. After that, we use a measuring cylinder to determine the volumes of the three solutions. The density is then obtained from:

Density= mass/volume

The density of pure water is always 1gcm-3.

Measurement of electrical conductivity will distinguish between the salt and sugar solutions. The salt solution will have high electrical conductivity. The solution with the highest electrical conductivity is the salt solution while the solution with the least electrical conductivity is the sugar solution. Sugar does not conduct electricity in solution because it does not contain ions.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.