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Total Acidity—Titration of Fruit Juices—Student Laboratory Kit

By: The Flinn Staff

Item #: AP6690 

Price: $29.22

In Stock.

The Total Acidity, Titration of Fruit Juices Consumer Student Laboratory Kit helps students build connections between chemistry and food science and nutrition. Students measure the “total acidity” of fruit juices by acid–base titration.

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Product Details

Is orange juice more acidic than grape juice? What about pineapple juice? Fruit juices get their sweet taste from natural sugars and their sour taste from acids, especially citric acid. The balance of sugar to acid content gives fruit juices their refreshing taste. In this activity, students measure the “total acidity” of a variety of fruit juices by acid–base titration with sodium hydroxide. Different student groups determine the citric acid content in orange, pineapple and white grape juice. The entire class can then rank the juices from most acidic to least acidic and compare results against their predictions. A great value, this kit will help your students build essential connections between chemistry and food science or nutrition. Includes reproducible student handouts, detailed background information, Teacher Notes with sample data and answers to questions and all necessary chemicals and consumable supplies.

Complete for 30 students working in pairs.


Materials Included in Kit: 
Phenolphthalein solution, dropper bottle, 1%, 30 mL
Sodium hydroxide solution, 0.1 M, 500 mL, 3
Grape juice, white, 10 oz
Orange juice, pure, 6 oz
Pineapple juice, 6 oz, 2
Pipet, Beral-type, graduated, 15

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Using mathematics and computational thinking
Constructing explanations and designing solutions

Disciplinary Core Ideas

MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
HS-PS2.B: Types of Interactions
HS-ETS1.C: Optimizing the Design Solution

Crosscutting Concepts

Energy and matter
Structure and function
Stability and change
Systems and system models

Performance Expectations

MS-PS1-2: Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-2: Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-3: Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.
HS-LS1-1: Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins, which carry out the essential functions of life through systems of specialized cells.
HS-LS1-6: Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules.