Does Temperature Affect Orange Juice Acidity?

Results continued...

Results:

Testing pH

Refrigerated Orange Juice:

Day 1: 32 degrees, 4.5 pH

Day 2: 31 degrees, 5.0 pH

Day 3: 30 degrees, 5.0 pH

Day 4: 30 degrees, 5.0 pH

Day 5: 29 degrees, 5.5 pH

Room Temperature Orange Juice:

Day 1: 45 degrees, 4.5 pH

Day 2: 47 degrees, 4.5 pH

Day 3: 47 degrees, 4.5 pH

Day 4: 48 degrees, 4.5 pH

Day 5: 49 degrees, 4.5 pH

My Materials

Materials:

1) Orange Juice

2) Three cups

3) Thermometer

4) pH strips

5) Storage places

pH Scale

Left Outside Orage Juice:

Day 1: 50 degrees, 4.5 pH

Day 2: 51 degrees, 4.5 pH

Day 3: 50 degrees, 4.5 pH

Day 4: 50 degrees, 4.5 pH

Day 5: 52 degrees, 4.5 pH

Independent Variable:

Dependent Variable:

Storage temperature

Conclusion

PH of the orange juice

Background Information

Procedures:

1) Pour orange juice into 3 separate cups.

2) Test the pH and temperature of each before placing them into storages.

3) Record the color of each pH strip and temperature.

4) Place each cup into a separate storage with different temperatures.

5) Place one in a fridge, one in a freezer, and leave one out in room temperature.

6) Leave for 24 hours.

7) After 24 hours, check pH and temperature.

8) Record the color of each pH strip and temperature.

9) Repeat steps 4, 5, 6, 7, and 8 five more times.

10) Use descriptive details when recording colors.

PH measures the amount of acid in a substance. This scale only measures from 0-14. 7 being neutral, below 7 being acidic, and above 7 being basic. The higher the temperature is, the higher the hydrogen ion concentration is, which means that the pH level is lower. This is like saying that the higher the storage temperature, the more acidic the orange juice will be.

In conclusion, the refrigerated orange juice was the one with the highest pH, which is good, because the higher the pH, the less acidic something is. Even though, the refrigerated orange juice was still acidic, it was okay, considering it being 100% orange juice. The orange juice that was left in room temperature began growing mold on it the 3rd day. So, if you plan on drinking orange juice, make sure it wasn’t left out.

Question:

pH Scale

Does storage temperature affect orange juice acidity?

Hypothesis:

Yes, storage temperature does affect orange juice acidity. The cooler the storage temperature, the more basic the orange juice is. The warmer the storage temperature, the more acidic the orange juice is.

Does Temperature Affect Orange Juice Acidity?