Resources

The Browning Apple

Beginner
Red Apple Photo: © iStock-132027480
  • Chemistry
  • Health
  • Measurement
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Resource Type
Experiment
Subjects
Chemistry
Topics
Ecosystems Health Scientific Inquiry
Time for activity
75 Minutes

Liquids all around us may be acidic or basic (alkaline) or neutral in their properties. For examples, acids taste sour; while bases taste bitter and feel slippery. However, both strong acids and strong bases can be very dangerous and burn our skin. So, it is very important to be very careful when using such chemicals. In order to measure how acidic or basic a liquid is, chemist use pH scale.

Sience S
Technology T
Engineering E
Mathematics M
Introduction

Liquids all around us may be acidic or basic (alkaline) or neutral in their properties. For examples, acids taste sour; while bases taste bitter and feel slippery. However, both strong acids and strong bases can be very dangerous and burn our skin. So, it is very important to be very careful when using such chemicals. In order to measure how acidic or basic a liquid is, chemist use pH scale. pH scale ranges from 1 to 14, where 1 to 6 is classified as acidic, 7 neutral (neither a base nor an acid) and 8 to 14 is classified as base. pH paper or universal indicators are used to determine if a solution is acid, base or neutral. Natural indicator like juice from red cabbage is used as pH indicator to determine pH values by observing color changes.

Key Objectives
  1. To explore the chemical reaction behind apple browning.
  2. To understand enzyme in the fruits reacts with oxygen in the air
    to tern fruits brown.
  3. To understand how fruits can be protected from browning using
    natural acidic juice such as lime.
  4. To get the idea of natural preservation of fruits.
Guiding Questions
  1. Have you noticed what happens to fruit – like
    apples – if it is cut and left in the air?
  2. Do you see this with all fruit? how about vegetables?
    other fruit?
  3. Is brown apple safe to eat? or does it go to
    waste?

Authors

Dr Mya Thein, Head of Science, Brainworks – Total Group of Schools References: 1. Science Experiment: The Brown Apple Project: Food Science, Plant Science Link: https://extension.purdue.edu/4h/Documents/Volunteer%20Resources/Science%20Made%20Easy/Brown%20Apples.pdf 2. Food Explorations Lab I: Enzymatic Reactions Link: https://naitcapi.usu.edu/media/uploads/2017/03/20/Enzymatic_Reactions_Teacher_Key.pdf