I am doing a lab on finding the molecular mass of a volatile liquid.
I first need to find the volume of water in the test tube. (V= m/d)
... but how do I find the density of the water in the first place?
I'm so lost right now.
Thanks for the help!!!
take the vloume of the liquid and divide it by the mass of it
To find the density of water, you can consult a table or use the accepted value of 1 g/cm³ at standard conditions (25°C and 1 atmosphere of pressure). However, if you are required to determine the density experimentally, you can follow these steps:
1. Take a clean, dry graduated cylinder and measure its mass (m₁).
2. Fill the graduated cylinder with distilled water to a known volume, such as 25 mL.
3. Measure the total mass of the graduated cylinder with the water (m₂).
4. Subtract the mass of the empty graduated cylinder from the total mass to find the mass of the water (m = m₂ - m₁).
5. Divide the mass of the water by its volume to calculate the density (d = m/v).
Remember to ensure accurate measurements by reading the level of the water at the meniscus, the curve formed at the surface due to surface tension. This method should provide you with the density of water, which you can then use in your further calculations for finding the molecular mass of the volatile liquid.