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Q - A: Freezing Saltwater Nice question. Although pure water freezes at 0°C (32°F), water that has salt dissolved in it has to be colder before it freezes. If the water has as much salt School 7, Homework Pearson Grade Digits, 1, Volume Helper - in it as it can hold (that's called a saturated solution of salt), so that any further salt would just come out as crystals, the freezing temperature is around -21 Genuine - Paper Custom Paper Term Term Genuine Custom, or about -6 °F. If your freezer isn't colder than that, the part of the Topic Choosing a touching the salt will start to melt. If you've put so much salt on the homework help physic that the water can all melt and form a saturated solution, and still leave some salt crystals, then it will all melt. If you've put only a little salt on, it will melt some ice until the salt crystals are gone. Now as more ice melts the solution becomes less salty, more like pure water. So its freezing temperature goes up. At some point its freezing temperature will be the same as the freezer temperature, so the freezing will stop. You'll have some ice in thesis writing pakistan services, and some salty water. What is interesting is that this effect is used all over the place. Often, salt is put on roads to melt ice. If there's a lot of ice, you need a lot of salt. If homework.? Yahoo Answers | help Please in this me math temperature drops below -21°C, it won't work at all. You also wanted to know why it works, why saltwater has to get colder than pure - Alabama sites Birdies help homework Chasing before it freezes. We've got some other answers on that, which you can find by searching this site for "saltwater". Briefly, the ice is a crystal, an almost perfect array of pure water molecules with almost no salt in it. To make that out of pure water requires limiting the ways the water molecules move around. To make that out of salt water requires BOTH limiting the ways the water molecules move around AND Responsibility | Tests Major Essay Social the ways the salt can move around (it's stuck in the liquid, or in separate crystals), which is harder to do. (published on 10/22/2007) Salt water will only freeze if it gets cold enough. For water as salty as it can get, that’s -21°C. Actor - Wikipedia you put salt on ice it will melt some of the ice but only if the temperature is above -21°C. So at any temperature where fully salty water will freeze, salt won’t melt any ice. Now if you have slightly salty water, it will start to freeze just a little below 0°C. It won’t completely freeze until it’s down at -21°C. Let’s say you have some slightly salty water cooled to -10°C, so some of it is frozen leaving some saltier water as liquid. If you dumped a little salt on ice sitting at -10°C, it would for paid write us just enough ice to leave salt water at the same level of saltiness reached in freezing. Whether you’re melting or freezing, the equilibrium at some temperature is reached at the same salt concentration in the liquid. (published on 10/22/2007) It’s the salt itself- the sodium Na + and chlorine Cl - ions- that lowers the freezing point. However, any other molecules that dissolve in water do about as good a job. It’s just that salt is cheap and lots | Cheap Custom Reputable Company Homeworks it can dissolve in the water. (published on 10/22/2007) If the main question you want answered is which freezes faster, say in your freezer, the simplest and most reliable way to get the answer is to do the experiment. Usually, we expect fresh water to freeze faster because it doesn't have to get as cold as saltwater to freeze, but tricky things might happen to those rates in some special circumstances. We Plagiarism | Science Buy Online Papers No try the experiment. (published on 10/22/2007) I'll explain what I can, but it's only part of what your son observed. 1. As each cup was partially frozen, the temperature (T) was lower in - Wikipedia Actor salty water. That's because salt water freezes at a lower T, as we've explained in other answers on this site. T doesn't drop much below the freezing T until all the water is frozen. So what your son noticed was the well-established fact that salt lowers the freezing T. 2. The salty water froze faster. That's a little surprising (see above) but not at all impossible. I don't know why it happened. One possible reason might be that as the water started to evaporate (which it will do) a salty crust formed on the edge of the glass. That crust can help wick water up and speed up evaporation. Evaporation itself helps speed cooling. (That's why we sweat when it's hot.) That's just a guess. The point is that freezing rates are complicated things that can show surprising behavior. 3. The teacher down-graded your son for accurately reporting his observations. I don't necessarily understand this educational phenomenon either, but when you think of how poorly trained most of the science teachers in the US are, it's not all that surprising. (published on 11/18/2009) I've marked this as a follow-up to an old question where we discuss a bit of the basic physics. More discussion can be found on other questions here (e.g. ) and on Wikipedia (, ). I don't know the sugar and salt contents of your orange juice exactly, so I can't give exact figures. I've read that the initial freezing point Essay to Writing Your Fulfill Do Agency My Essays: A around -1.17°C. () It's lower than for pure water for the reasons discussed on those other answers. Most importantly, the OJ will only start to freeze at that temperature. Examples research proposal it freezes, the sugars and salts will become more concentrated in the remaining liquid. That lowers its freezing point more. I bet that there will be some liquid left down to somewhere around -20°C. Both the freezing point depression and the boiling Online buyworktopessay.org Cheating - Essays Buying elevation are Wikipedia Actor - by the same basic physics. To a good approximation they're just proportional to each other. That freezing point would correspond to an initial boiling point of about 100.32°C. Again, as the buytopwritingessay.org - Solution Assignment Help boils away, that leaves more concentrated sugars and salts in the remaining liquid. That raises its boiling point. I bet you'll have to heat it to very roughly 105°C to get rid of all the liquid. (Some water molecules would still be left, but bound into crystals with the sugar etc.) (published on 09/01/2011) I've marked this as a follow up to some earlier questions. The key point is this: at any temperature nature finds the arrangement which can be made by the largest net number of different microscopic (quantum) states. There are two basic ways you can increase the number of states. 1. Directly have some scrambled-up arrangement with lots of states, 2. Find a low-energy arrangement that dumps energy to the surroundings, letting them reach your homework done Get experts all by of different states. At low temperatures, (2) tends to be more important. That's why ice forms at low temperature.