make during lab:
Patterns you notice in your
Explanations for the patterns:
pH paper in lemon juice turns red
pH paper in distilled water turns yellow
pH paper in tomato juice turns reddish orange
pH paper in ammonia turns blue
pH paper in vinegar turns red
pH paper in cola turns red
pH paper in milk turns yellowish orange
pH paper in dish washing detergent turns yellowish orange
pH paper in milk of magnesia turns blue
pH paper in chlorine bleach turns blue
water + gelatin = no gelatin breakdown
Meat tenderizer + gelatin = gelatin breakdown
Canned pineapple + gelatin = a little gelatin breakdown
Fresh pineapple + gelatin = gelatin breakdown
Apple turns orange/red when Benedict’s solution is added
Butter turns translucent after drying on newsprint paper.
Egg white turns pinkish purple when Biuret reagent is added to
Fish turns pinkish purple when Biuret reagent is added to it.
Potato turns blue-black when Lugol’s solution is added to
Vegetable oil turns translucent when dried on newsprint.
Water does not react to any of the indicators.
orange pH paper turns red in acidic solutions, yellow in neutral
solutions, and blue in basic solutions
Meat tenderizer and pineapples have enzymes in them.
Fruits contain sugars.
Vegetables contain starches.
Animal based products contain proteins.
Vegetable oil and fats contain lipids.
Acidic substances have hydrogen ions in the molecular structure,
basic substances have a hydroxide group. Indicators like pH paper
react differently to these hydrogen and hydroxide ions.
Plants and animals have enzymes in them to help speed up reactions
such as the breakdown of gelatin.
Indicators can be used to classify the type of organic molecule
that is present. These substances change color due to structural
differences in the organic molecules.
All living things are composed of four biomolecules: carbohydrates,
lipids, proteins, nucleic acids.