what is the freezing point in the desert?
The "freezing point" of any particular pure chemical substance is the same everywhere, in the desert as much as anywhere else, except for a slight effect of prevailing pressure!
You must know the freezing point of the pure substance first. Freezing point depression happens when you have a substance with impurities (the amount and type of the impurities determines the change in freezing point). So once you have your recorded freezing point of your slightly impure substance (the FP that you measure), subtract that from the literature value for the freezing point of the pure substance (this can be found online for your particular…
For the definition and description of freezing point lower or freezing point depression [http://www.answers.com/freezing+point+depression?cat=technology&gwp=13 Click here for the answer from Answers.com] For how to solve a freezing point depression problem with step-by-step instructions click on this question: [http://wiki.answers.com/Q/How_do_you_solve_freezing_point_depression_problems How do you solve freezing point depression problems?]
The freezing point of saltwater is lower than the freezing point of freshwater upto a specific ratio of salt & water. The freezing point goes below upto -11 C, but if you increase the salt content thereafter the freezing point will increase above 0 c. The sal and water mixture is usually termed as "Brine"