Chemistry education Lab report

Aim:

To determine the density of a solid using two methods

 

Introduction:

The density (mass/volume), of a metal cylinder will be calculated twice using two different methods to determine its volume. (liner measurements and water displacement). Then you will use the density to attempt to identify the metal.

Equ 1. D= m/v ,  Equ 2. V=𝜋r2 L and Equ 3: Volume of object = Final volume – Initial volume

 

 

Procedure:

– An unknown metal cylinder with ID code 25 was selected.

– The density of this metal cylinder will be calculated using both methods A and B below. Then the identity of the metal will be determined based on the density value attained.

 

  1. Calculate density of a metal cylinder, using VOLUME FROM LINEAR MEASUREMENTS:

For regularly shaped objects such as a cylinder, it is usually possible to measure the dimensions of the object and use a formula to calculate the volume of the object. The volume of a cylinder is calculated by multiplying 𝜋 times the square of its radius times its length (V=𝜋r2 L).

 

1). A balance was used to determine the mass of the metal cylinder to be 4.56 g

2). Using a Vernier calipers, the diameter was 0.5 cm and length was 2.8 cm

2). Calculate volume and density of the cylinder, using equations 1 and 2 above.

 

  1. Calculate density of a cylinder, using VOLUME FROM WATER DISPLACEMENTS:

A more general method for volume determination that will work with both regular and irregular shaped objects is the method of water displacement. The water level in a graduated cylinder is recorded, an object submerged in the water and the new water level read. The difference in water levels is the volume of the object.

 

1). The initial water level in graduated measuring cylinder was 10 cm3

2). After the same metal cylinder (used in part A, above), was placed in the graduated measuring cylinder, the water level rose up to 10.5 cm3

4). Calculate volume and density of the cylinder, using equations 1 and 3 above.

 

Assume the metal cylinder is one of the following: aluminum, coper, iron, or lead. Look up the density of each metal and determine the composition of your cylinder

 

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