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Q:
How much salt do I need to add to 40 gallons of water to lower the freezing point to -10F?
- Baz (age 10)
San Antonio, TX, USA
A:
You can't do it. There's only a certain amount of salt (NaCl) that will stay dissolved in the water, giving what's called a saturated solution. The freezing point of saturated saltwater solution is about -21°C, or -6°F. Maybe some other salt would work, but not ordinary table salt.
Mike W.
(published on 02/04/2012)
Follow-Up #1: saturated salt solution
Q:
Correction: How much salt do I need to add to 40 gallons of water to make a saturated solution?
- Baz (age 10)
San Antonio tx usa
Follow-up on this answer.
