Determination of Density of an Unknown Liquid

How can we determine the density of an unknown liquid?

A student weighs an empty flask and stopper with a mass of 25.7109 g, adds 0.53 mL of the unknown liquid, and heats the flask in a boiling water bath at 98.8 °C. The total mass of the flask with the liquid becomes 26.3421 g. What is the density of the unknown liquid?

Calculation of Density of the Unknown Liquid

To calculate the density of the unknown liquid, we need to use the given measurements of mass and volume. The mass of the empty flask and stopper is measured as 25.7109 g. After adding the unknown liquid and heating the flask, the total mass is found to be 26.3421 g.

First, we need to find the mass of the unknown liquid. We can do this by subtracting the mass of the empty flask and stopper from the total mass after adding the liquid:

Mass of the unknown liquid = Total mass - Mass of the empty flask and stopper

Mass of the unknown liquid = 26.3421 g - 25.7109 g = 0.6312 g

Now that we have the mass of the unknown liquid, and the volume added to the flask is 0.53 mL, we can calculate the density:

Density = Mass of the unknown liquid / Volume of the unknown liquid

Density = 0.6312 g / 0.53 mL

Since the volume is in milliliters, the resulting density will be in grams per milliliter (g/mL).

By performing the calculation, we can determine the density of the unknown liquid.