Question

In: Chemistry

You are given three small irregularly shaped pieces of metal and the following materials: Everything in...

You are given three small irregularly shaped pieces of metal and the following materials:

Everything in your set of Common Lockers

Your lab notebook

Distilled water

Cylinder of Copper

Ruler

1 M HCl

1 M NaOH

pH paper

universal indicator

balance

If you wished to quantitatively determine the density of your metal pieces, which procedure would be best when provided with the resources listed above?

*	Determine the mass of each unknown metal. Then determine the volume of each piece of metal using a ruler and assuming each metal is a cylinder.

*	Determine the mass of each unknown metal piece. Then use the graduated cylinder to determine the volume of each metal piece by water displacement. Dividing the mass or each metal piece by the volume will give the experimentally determined density.

*	Determine the moles of metal present by reacting the unknown metal with 1 M HCl. Convert moles of metal to mass of metal and divide this by the volume of each piece of metal as determined by water displacement.

*	Throw all of the metal pieces in a glass beaker and shake them. The pieces that move to the bottom are more dense than the pieces that move towards the top.

Expert Solution

Option (2) is the correct option to determine the density of a metal piece in the lab.This procedure will give accurate mass and volume, thus the density calculated will be accurate.

The first option assumes metal pieces as cylindrical, which will give inaccuarate volume, and therefore inaccurate density.

The third option requires reaction of metal with 1M HCl to calculate its moles. This method could not be used if the metal is of low reactivity(below Hydrogen in reactivity series). Also it is time consuming even for those metals with react with HCl. Along with this,there is scope of experimental errors which will contribute to inaccurate results.

The fourth option is wrong because shaking three small metal pieces in a beaker will not make denser metal pieces go to bottom and lighter metal move towards top, We can not use this this method for qualitative and quantitative measurement of density of metal pieces.

queen_honey_blossom answered 2 years ago

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