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Sugar Crystal Growth: Science Fair Project

12/25/15--1/28/16

Description

Purpose: To find which type of water makes crystals grow best.

Water Types: Tap and Distilled Water

Findings:

1. The crystals grew best in tap water. After searching the web, I saw that many people got different results though.

2. To saturate hot water, you need more sugar to do so than cold water.

3. Saturation/Concentration of the sugar affects crystal growth.

Testable Question:

Total Crystals Grown Together:

How does the type of liquid affect sugar crystal growth?

Hypothesis:

I hypothesize that if you use distilled water to grow sugar crystals, then the crystals will grow bigger and better because distilled water is more pure and the water must be pure for sugar crystals to grow well.

Sources/Bibliography:

Data Table:

Tap Water

Trial #1:

Type of Water: Distilled Water / Tap Water

_____________________________________________

Trial #1: 2 cm / 3.5 cm

Trial #2: 4 cm / 3 cm

Trial #3: 2cm / 2 cm

3.5cm

Materials:

Source A: by Anne Marie Helmentsine Ph. D Chemistry Expert "How to grow sugar crystals"10/09/2014

Source B: by Anne Marie Helmentstine Ph. D Chemistry Expert"Crystal growing" Date not shown

Source C: by Wikipedia the Free Encyclopedia "Crystalization"10/24/15

Trial #2:

3 cm

Procedure:

Line Graph:

1. Two small cups

2. Two pencils

3. Two pieces of 20cm cotton string

4. 100ml of distilled water

5. 100 ml of tap water

6. 8.8 ml of sugar

7. Metal bowl

8. Cup of boiled or hot water

9. Stove

10. 58ml measuring cup

11. 1 Pitcher

Trial #3:

2cm

Abstract

1. Get all the materials.

2. Put metal bowl on stove and pour cup of boiled water into bowl. Turn stove onto high.

3. Put pitcher in metal bowl and pour in 100ml of tap water in pitcher.

4. Stir 4.4ml of sugar into 100ml of tap water in pitcher until saturated.

5. Pour mixture into small cup to about halfway.

6. Tie one of pieces of string to pencil and dangle it in water, making sure the string doesn't touch the sides of the small cup so pencil is resting on sides of cup.

7. Repeat steps one through six but use 100ml distilled water in step three and four.

8. Place tissue over each cup and put cups in a location with no vibration.

9. Record observations after letting the crystals grow for one week in location choosen.

Observations

Variables, Constants, Trials:

The purpose of my experiment was to determine if the type of water used will affect sugar crystal growth. I hypothesized that if you grow crystals with tap water, then the crystals will grow better. The independent variable was applied to three groups to represent three trials. I observed and recorded my observations for each trial. The observations show that the sugar crystals grew better in the tap water. The results did not support my hypothesis. This experiment could be improved by make sure the concentration of the water is the same. Findings from this investigation are useful to scientists who grow crystals. This investigation has lead me to a new question regarding the saturation of water. Does saturation affect sugar crystal growth?

Trial #1: Tap water had more seed crystals. Distilled water didn't have as many seed crystals so it didn't do as good as the tap water crystals.

Distilled Water

Trial #2: I saw that distilled water had more seed crystals than tap water. The end crystal of distilled water was 4 cm long! Tap water still did well, but it didn't do as well as the distilled water.

Independent Variable: The type of water

Dependent Variable: Sugar Crystal Growth

Constant Conditions: Location, Time Given, amount of water, length of string, amount of sugar, temperature, cup size, number of trials

# of trials: Three

Trial #1:

2cm

Trial #3: The last trial's results showed that the crystals grew the same length. There were probably the same number of seed crystals and the saturation of the water was also the same so they grew the same length.

Conclusion:

Trial #2:

4cm

Trial #3:

2cm

I thought if you use distilled water to grow crystals, then the crystals would grow better because distilled water is more pure. It affects the way crystals grow by making them grow in different sizes and shapes. I found that crystals grown in tap water grew better, so my hypothesis doesn't support my data. My data shows after the crystals grew for one week, the crystals grown in tap water grew and average of 2.8 and the distilled water crystals grew and average of 2.6 cm long. They only grew 0.2cm apart! I got my results because I grew crystals in tap and distilled water with three trials total. Saturation could have affected my results because tap water had more seed crystals. The only thing that surprised me was distilled water didn't do as well as tap water. In the future, I would like to see how saturation affects crystal growth. I learned you have to be patient and precise. Also, I learned saturation affects how well the crystals grow and according to my experiment, tap water makes sugar crystals grow better over distilled water. I really enjoyed this experiment.

Thank You!

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