My STEM Fair Project

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# My STEM Fair Project - PowerPoint PPT Presentation

My STEM Fair Project. Mr. Thornton. Question. Does the temperature of water affect how long salt dissolves?. Purpose. I wanted to do this project because we were learning about mixtures and solutions in science class and I always wondered what makes salt dissolve faster. Hypothesis.

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Presentation Transcript

### My STEM Fair Project

Mr. Thornton

Question

Does the temperature of water affect how long salt dissolves?

Purpose

I wanted to do this project because we were learning about mixtures and solutions in science class and I always wondered what makes salt dissolve faster.

Hypothesis

I think the warmer the temperature of the water it will dissolve salt faster because I know that hotter temperatures have particles moving faster and maybe they’ll break up the salt faster.

Materials
• 3 clear plastic cups
• salt
• teaspoon (for measuring)
• teaspoon (for stirring)
• hot, room temperature, and cold water
• stop watch
• markers to label cups
Variables

Independent: Temperature of the water

Dependent: Amount of time for salt to dissolve (in seconds)

Control: size of cups, amount of water, amount of salt, stirring speed

Step-by-step Directions

Label 3 cups: Hot, Room Temp., Cold

Pour 100 mL of hot water in the cup

Measure a level teaspoon of salt

Dump the salt in the hot water cupand start the timer

Stir the salt repeatedly until the salt is dissolved

Record the time it took to dissolve the salt

Repeat steps 2-6 two more times.

Repeat steps 2-6 three times with Room Temperature water

Repeat steps 2-6 three times with Cold water

Conclusion

According to my data, my hypothesis was correct. Warmer temperatures do make salt dissolve faster in water. The average time it took to dissolve salt in hot water was 22.6 seconds, which was faster than room temperature’s average time, 43.3 seconds and way faster than cold temperature’s 78.6 seconds. I think this is good to know especially for cooks who have to dissolve salt or sugar when they cook. One way to improve this experiment would be to be more careful I was stirring the same speed because I am not sure if I was stirring with the same speed or not. If I did this experiment again, I would try it with sugar and see if I got the same kind of results. I also wonder if the same thing would happen if I used a different liquid like vinegar.