Our Hypothesis

I think that the rock salt will melt the ice cube fastest, because it is one of the finer ground up salts and it is denser than most salts. Pink Himalayan has less sodium than sea salt because it is one of the least grinded salts and is less dense than sea salt so pink Himalayan is second fastest.

Background: We had a question why some salts melt faster than others. The answer is because some are ground finer than others, that means that some are grind longer than others. Since salt isn’t very hard to grind that means that it’s easy to get high quality salts so the finer grinded the salt is the faster the salt melts ice.

Why does salt melt ice?

Salt melts ice because of something called freezing point depression. It is when the freezing point of a solution is less than ice that makes the molecules harder to form in their rigid structure. Making it turn into water.

Manipulated variable: The type/size of salt.

Responding variable: How fast ice cube melts.

Controlled variable: The cup, the size of the ice cube, temperature.

Control test: no salt.

The type of experiment is this: A lab experiment.

Procedure:

1. First you use a food scale to measure the ice cubes. Then make sure they are the same number of grams.
2. Then You get four glass cups of the same size, and then you put an ice cube in each cup.
3. Then you put 1 type of salt in each cup on top of the ice cube. The types of salt at once and wait however long it takes.                                                                              
4. You also record the time of each Ice cube, and do all at the same time just to make sure nothing goes wrong

Salt that caused ice to melt from fastest to slowest: first kosher salt second rock salt third pink Himalayan salt fourth salt spring salt fifth Italian imported salt six pure flake sea salt seven no salt           

In our conclusion we found that the kosher salt melted the ice cube the fastest. When we did the experiment the temperature in the house was 21.3 it changed halfway to 21.4 Celsius, so it was a little hotter than before. It was in the shade and was also at 3;29pm and ended at 4;09.