Post Your Answer
1 year ago in Chemistry , Physical Chemistry By Adithi
How does the density of ethanol change with temperature?
In my lab, we use ethanol as a solvent for temperature-sensitive reactions and for calibrating instruments. A small error in volume-to-mass conversion due to temperature change can affect yield calculations and calibration accuracy. I'm looking for the functional trend and a rule-of-thumb for its magnitude in everyday lab conditions.
All Answers (1 Answers In All)
By Varun Answered 1 year ago
From my experience in analytical chemistry labs, this is a critical detail for precision. Ethanol's density decreases almost linearly with increasing temperature, like most liquids. Around room temperature, the coefficient is roughly -0.001 g/mL per °C. This means a 5°C change introduces a ~0.5% error in mass if you're measuring by volume. For practical work, I always recommend using a temperature-corrected density table or a calibrated volumetric flask at a specified temperature. Never assume the density on the bottle is correct if your lab temperature fluctuates.
ÂReply to Varun
Related Questions