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Home / 2017 / January / 19 / What is that goop that gets sprayed on the streets?

What is that goop that gets sprayed on the streets?

By Patty Wellborn on January 19, 2017

Stephen McNeil, associate professor of chemistry

Stephen McNeil, associate professor of chemistry.

UBC Okanagan associate professor of chemistry Stephen McNeil explains the chemistry behind ice and snow removal.

“Pure water freezes at zero degrees Celsius, but by adding salt, the freezing point is decreased. Consequently, it is used to de-ice roads and equipment, such as aircraft,” says McNeil.

Although rock salt (sodium chloride) is the most recognized compound to add, another salt, magnesium chloride, may be more effective. Because magnesium chloride dissolves into three particles, rather than two like sodium chloride, the freezing temperature is lowered even further, and less magnesium chloride needs to be used.

As a result, each salt has an optimal temperature of use. Sodium chloride works at temperatures from zero to minus six degrees Celsius and magnesium chloride works down to minus twelve degrees.

Although, if used too liberally, both salts can cause corrosion. They are also both natural substances and are not toxic.

Depending on which salt is used, the streets may take on a different colour. Rock salt application may result in a pink hue.

Posted in News | Tagged Chemistry, Irving K. Barber School of Arts and Sciences

Contact

Patty Wellborn
Assistant Communications Coordinator
University Relations

The University of British Columbia
Okanagan campus
Tel: 250-807-8463
E-mail: patty.wellborn@ubc.ca

See other posts by Patty Wellborn

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