A pycnometer is a glass flask with a tight fitting glass stopper that can be used to determine the density of an insoluble solid by measuring the volume of water ejected out of the pycnometer when sample of the solid is placed in it. Determine the density in g/cm' of an unknown metal alloy sample from the following measurements. Assume the density of water is 1.000 g/cm?. Mass of clean pycnometer = 25.151 g Mass of clean pycnometer plus water = 42.481 g Mass of clean pycnometer plus metal sample = 40.205 g Mass of clean pycnometer plus metal plus water = 54.265 g (after ejected water is dried from the outside surface)
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Mass of clean pycnometer = 25.151 g
Mass of clean pycnometer plus water = 42.481 g
Initial mass of water = 42.481 g -25.151 g = 17.33 g
Mass of clean pycnometer plus metal sample = 40.205 g
Mass of clean pycnometer plus metal plus water = 54.265 g (after ejected water is dried from the outside surface)
Mass of water left in pycnometer after ejection = 54.265 g - 40.205 g =14.06 g
Mass of water ejected = Initial mass of water -Mass of water left in pycnometer after ejection = 17.33 g -14.06 g =3.27g g
As density of water is 1.00 g/cm3
so, volume of water = mass of water
So, volume of water ejected = 3.27 cm3
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