Question

erica loves making lemonade with fresh - squeezed lemon juice and water. she noticed that after a day or two in the fridge, her lemonade would turn brown and lose its fresh taste. while looking at the ingredient list on a store - bought lemonade bottle, she saw that it included sugar and citric acid. erica wondered if adding these ingredients to her homemade lemonade would help preserve its color and freshness. to test this idea, erica prepared six identical bottles of freshly squeezed lemon juice from the same batch. she added one teaspoon of sugar to two of the bottles and one teaspoon of powdered citric acid to the next two. she added nothing to the remaining bottles. then she labeled the bottles and placed them in the fridge. after three days, she observed that the bottles with plain lemon juice and the ones with sugar had all turned brown, while the ones with citric acid stayed bright and fresh. erica now predicted that citric acid was more effective than sugar at preserving lemonades color and freshness.

Explanation:

Step1: Identify the experiment setup

Erica has 6 bottles of lemon - juice. 2 with sugar, 2 with citric acid, 2 with nothing added.

Step2: Analyze the results

Bottles with plain lemon - juice and with sugar turned brown. Bottles with citric acid stayed bright and fresh.

Step3: Draw conclusion

Based on the observed results, citric acid is more effective at preserving color and freshness.

Answer:

Citric acid is more effective than sugar at preserving lemonade's color and freshness.