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Old 12-05-2005, 05:27 PM
Helpless Mom Helpless Mom is offline
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my son has ascience fair project - Which freezes more quickly plain water or water with salt in it? How much salt do we use? When we find out which freezes faster how will i know how to explain the Why?
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Old 01-18-2006, 04:35 PM
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Quote:
Originally Posted by Helpless Mom
my son has ascience fair project - Which freezes more quickly plain water or water with salt in it? How much salt do we use? When we find out which freezes faster how will i know how to explain the Why?
My advice to helpless mom is to test with 1 teaspoon, one with 1 tablespoon and so on and see if as the amount increases, if the freezing time decreases and to explain the why, research on what salt do to the density of water b/c density is important in this, GOOG LUCK!
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Old 01-26-2006, 04:43 PM
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Okay, this is my advice.

First of all, try to keep your unit of measurement precise. Try not to use teaspoons to salt, but use grams if you have a balace. If you don't, use teaspoons. Keep the amount of water the same. I agree with Pluto. Add more and more salt.

I don't know who you're going to freeze water. I mean, you have to put it in a cold environment to freeze it, and you can't read a thermometer and wait for it to freeze in the freezer. Or you can read the thermometer every minute or 30 seconds or 10 minutes (depending on how much water you have) and when ice begins to form, take the temperature. Remember to use Celsius. Also, don't wait until it fully freezes before you take the temperature. Then, you can't take the thermometer out. THE FREEZING POINT, BY DEFINITION, IS WHEN A LIQUID BEGINS TO SOLIDIFY, NOT AFTER IT HAS FULLY SOLIDIFIED.

After you have all the temperatures, it'll be interesting if you have your child make a line graph. X axis will be the amount of salt, Y axis the temperature when the liquid begins to freeze. Therefore, it'll be pretty easy to see what happens to the freezing point of the liquid when there is more salt.

Good luck!
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Old 03-31-2006, 05:17 AM
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Ok i dont have time to read other commenst so if i get same idea leave me alone Wel you take a small cup of water, and a samll cup of salt water. Put them in the freezer. Check every 30 min. to see which one freezes faster. My hypothesis is the salt will freeze first. Why, because salt water is more dense and it seems like it would be harder to freeze. The dead see is actually te saltiest ocean. You could lay back and the water is so dense you'll float with ease. That why its called the dead sea. Hope this helped
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