Lab Report: the Identification of Acids and Bases Paper
An acidic solution has a pH below 7. Acids can be strong acids which unionize completely in aqueous solution or weak acids which unionize partially, A base is a substance that combines with acids to form salts; a substance that dissociates to give hydroxide ions in aqueous solutions; a substance whose molecule or ion can combine with a proton (hydrogen ion); a substance capable of donating a pair Of electrons (to an acid) for the formation Of a coordinate covalent bond. Bases can be strong bases which are able to dissociate completely n water or weak bases Which dissociate partially.
In this practice we use natural indicators, which are pH indicators in the form of plant pigments known as anticyclones Which change color over different pH ranges and depending on source for the PH. Naturalization is a chemical reaction in which a base and an acid react to form a Materials: Droppers Hadrian appeared Cabbage indicator Milk Bleach Yogurt Microscope I Vinegar Easy Off MGM (OH) Water Mercuric acid Beakers Detergent Methods: 1. Open the dropper, put the pH strip inside the bottle, analyze the pH of the absence according to this table: 2.
Put S drops on the microscope of each of the substances and 3 drops of the natural indicators and watch the change in the color. Results: I Hadrian Appear Red cabbage indicator I Substance I Color PHI Color PHI Detergent s,’Ml 1 91 Greensville 8-9 | Yogurt 1 1 41 Retrospectively-6 Milk 171 Violet Waters 71 Violet 71 MGM(OH) | 10 Greenish blue 8-9 | Mercuric acid I Easy Off 12 Blue 10-11 | Vinegar Ill Red 1-2 | Bleach 114 1 Yellow | 12-14 Analysis: The red cabbage is less reliable than the Hadrian paper.
Conclusions: Depending on the pH Of the substance the Hadrian paper Will show certain colors and the change in color of the red cabbage also depends on the pH of the substance. Complementary task: 1. Explain what is and indicator A compound which changes color depending on the pH of the solution of which it is a part. 2. How are indicators produced? From plant extracts. 3. Mention 3 examples of acid-base indicators, including the range of pH at which they work and the observed colors, use the following chart: Indicator Color pH Range I Acid Base
Methyl Red I Yellow I Red 4. 8-6. 0 | Brotherly Blue Yellow Blue 6. 0-7. 6 Phenol Red I Yellow I Red 6. 8-8. 4 | 4. Investigate the real pH of the substances used in practice. Indicate if the substance is an acid, a base or if it is neutral. Final reflection: Knowing if a substance is an acid or a base is very important to prevent accidents of skins corrosion due to acids and to avoid mixing substances that may cause a lower PH. Acids and bases are present everyday since we eat yogurt for breakfast until we wash our clothes before going to sleep.