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Erika García

on 30 March 2014

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Transcript of ACIDS AND BASES

Our purpose in this experiment is to identify substances as basic, acidic or neutral. If the substance is acid then the pH will be below 7, if the substance is base, then the pH will be high than 7, and neutral is 7.
In this lab practice we will work with different substances, in order to find the type of each one, there are various types, the solutions may be strong acid which means that ionize completely, because strong acids produce the maximum number of ions, they are good conductors of electricity; could be weak acid that is an acid that ionizes only partially in dilute aqueous solution, produce fewer ions and thus cannot conduct electricity as well as strong acids; or in other hand could be bases that also are divide into strong bases, that dissociates entirely into metal ions and hydroxide ions and weak bases, that ionize only partially in dilute aqueous solution. For determine this type of solutions, we will use a natural indicator, substances that change color depending on the concentration of hydrogen ions in a solution, this is to know the pH of them that is an indicator of how acidic or basic is the substance. The neutralization is the reaction of an acid with a base in aqueous solution to produce a salt and water.
1. Mixer
2. Red cabbage indicator
3. Micro plate
4. Dropper
5. pH indicators.
6. Antiacid: Mg(OH)2
7. Bleach: NaClO
8. Milk: C3H6O3
9. Detergent: NaOH
10. Degreaser: Na2SIO3
11. Muriatic Acid: HCl
12. Vinegar: C2H4O2
13. H2O

First Part
1. In the micro plate, place 3 drops of each one of the substances.
2. After that add 3 drops of the Red cabbage indicator.
3. Mix well the substances
4. Watch for the change in color and take notes

Second Part.
1. Place the pH indicator inside the bottle of the formula.
2. Check that the indicator had turned to other colors.
3. Compare the new colors with pH color code.
4. Depending of the color, analyze and take notes.

Discussion or analysis
The pH measures the concentration of hydrogen ions in water, so we think, base on our knowledge that the hydride paper would turn in different color depending if it is an acid or base. We might have mistakes because it was a little hard to determine the exact color of the hydride paper in the scale, but then when we did the same substance with the red cabbage indicator we saw that the results of both indicators was more or less the same. We think that is easy using the red cabbage indicator (and the colors that appear are really beautiful), but the hydride paper is more exact and you just need to check the colors in the pH scale.
In this experiment we learned how to classify the substances as acids or bases according to the change in color with certain indicators such as red cabbage and pH indicators. Our hypothesis was correct, acids turn to "warm" colors (red, orange...) and bases turn to "cold" colors (blue, green...). This was a very interesting and fun lab practice, we liked it a lot.
Complementary Tasks
1. Explain what is an indicator.
Is a substance that is added to the milieu, to yield the indicator reaction resulting in a color change at the ending point.
2. How are indicators produced?
It is produced because during the analysis is performed a change in the terms of the simple and indicates the ending point of titration.
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.

Final Reflection
As a team, we would like to say that this was a very interesting lab practice, the colors that appeared with the reactions of acids and bases were very pretty and we learned a lot about this topic. Acids have a pH lower than 7 and bases have a pH greater than 7, this is why the pH scale has those colors and why it is numbered that way.
Sandra Valeria Cantu Fonseca 1673701
Melissa Ceniceros Chávez 1659533
Erika Elizabeth García Cavazos 1662720
Rebeca González Gómez 1678114
Andrea Sofía Velázquez Gonzalez 1665366
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