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Identification of Acids and bases using natural indicator

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Jacqueline Hernández

on 29 March 2015

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Transcript of Identification of Acids and bases using natural indicator

Identification of Acids and bases using natural indicator
Lab Report
Identification of Acids and Bases
Common uses of acids and bases in daily life
These are two examples of acids: citric
acid in lemons and grapefruit and bases: ammonia in cleaning solutions we encounter in our daily lives. Other familiar acids are vinegar (acetic acid),vitamin C (ascorbic acid), and battery acid (sulfuric acid). Some familiar bases are drain cleaner (sodium hydroxide), baking soda (sodium bicarbonate), and antacids.
Materials
Substances
Water H2O
Bleach NaClO
Milk H3CCH(OH)COOH
Anti acid NaHCO3
Rexal NaCl0
Home cleaner HClO3
Muriatic acid HCl
Discussion or Analysis
The data obtained with pH indicators was then proven with and investigation of the real pH of the substances. The results may vary because the components of the substance are not the same. Our hypothesis said that the results of both indicators will be different in some cases, which proves that we were correct. Since we applied two methods and we believe that the hydrion paper method is more reliable and effective, because the perception of colors in red cabbage varies according to the person.

Purpose
Find the different pH levels of different substances using different methods (such as using a pH strip and indicator) and to determine according to its level, if it is an acid or a base. If the results are less than 7, the substance is an acid, if it's greater than 7, it's a base. However, the results will vary within each indicator.
Introduction
Indicators exist
naturally
in certain food, for example, grape juice, red cabbage (which is the one we used), cranberries, radish leaves, etc. Each indicator shows a color in an acid solution and another in basic solution. We also had the hydroin paper, which represents a range of color to determine the
pH
between 1 and 14. In this practice we identified the type of solution according to the color that the paper represented, and classified it as
strong

base
,
strong

acid
, or if it has a pH of 7, that will be
neutralization
. A
weak

acid
is one that ionizes only partially in dilute aqueous solutions; produce fewer ions and can’t conduct electricity as well as strong acids. On the other hand,
weak

bases
ionize only partially in dilute aqueous solutions. With this experiment we found out if the substances were acids or bases with the help of the indicators.
Methods
Method 1: Col indicator
1.- Add col indicator to micro plate
2.- Add 3 drops of each substance
3.- Wait for the reaction to occur
4.- Check the results
Results
Universidad Autónoma de Nuevo León
Centro de Investigación y Desarrollo de Educación Bilingüe
Chemistry 2
Teacher: Claudia Barahona
Jacqueline Hernández Martínez 1726987
Liliana Flores Díaz 1749190
Lorena Cecilia Mata Rodríguez 1753332
Edgar Joel Castillo Garza 1728103
Nancy Adriana Leal Cantú 1733305
March 29, 2015.
Group: 205
Lab Equipment
-Dropper
-Precipitated Glass
-Ph strips
-Micro plate
-Pipette
Method 2: pH strips
1.- Submerge a pH strips in each substance
2.- Compare it to the color of the chart provided
Conclusions
Complementary Tasks
1.- Explain what is an indicator.
An indicator is a substance that undergoes a distinct observable change when conditions in its solution change. A pH indicator changes color over a narrow range of pH values in solution.
2.- How are indicators produced?
Indicators are often made from plant extracts.
With this lab practice we learned how to use two different methods to obtain the pH levels of substances, and with the result to determine whether they were acids or bases. Our hypothesis was proven, which we said that the results between the two methods my vary and we believe that it is because each person sees colors differently.
3.- Mention 3 examples of acid-base indicators, including the range of pH at which they work and the observed colors.
4.- Research the real pH of the substances used in the practice. Indicate if the substance is an acid, a base or if it is neutral.
Final Reflection
Acids and bases exist all around us, the different foods or objects that we consume are these types of substances and we use them for all of our activities. Our stomach produces hydrochloric acid, which helps in the digestion of food without harming the stomach. During indigestion the stomach produces too much acid and people use bases called antacids to get rid of the pain. This is one of many example of the uses in biological systems.
References
http://berryberryeasy.com/2011/07/spm-chemistry-form-4-notes-acids-and-bases-part-2/
http://www.ch.ic.ac.uk/vchemlib/course/indi/indicator.html

http://www.freedrinkingwater.com/water-education/quality-water-ph.htm

http://www.pearsonhighered.com/hillkolb13einfo/assets/pdf/hill-kolb-ch07.pdf
Full transcript