Ph of Household Chemicals Essay

1892 Words Feb 23rd, 2015 8 Pages
| Ph of Household Chemicals | Formal Lab Report | Chemistry 1000 | | Fall 2014 |

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Purpose:
To determine the pH level of common household products and to determine whether they are an acid or a base using red cabbage as a pH indicator that will change colors according to the acidity levels.

Hypothesis: I believe that most of the cleaning chemicals will be acidic and most of the food/edible items will be neutral. I am also predicting that personal hygiene items are also neutral due to the fact that they are put on your body.
Scientific Background: “Chemists have a scaled called the pH scale that is based on hydrogen ion concentration to express the acidity or basicity of solutions. The pH scale is a logarithmic
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2. Remove 8-9 full leaves from the red cabbage and place them in the distilled water in the saucepan. It is acceptable if the leaves break into pieces while they are being removed from the cabbage head; however, make sure all of the pieces from 8-9 leaves are placed in the Distilled water. As much of the leaves as possible should be submerged in the water.
3. Boil the water and leaves on the stove until the leaves are nearly white (very pale) and the water is purple. 4. Carefully remove the leaves from the water using the tongs and dispose of the leaves in the trash after cooling.
CAUTION: The pan and its contents will be very hot. Use oven mitts to protect your hands.
5. Allow the water to cool to at least 40ºC before beginning Part B.
NOTE: Cooking the cabbage leaves will stink, though the fumes are not harmful. Please use the ventilation hood above the stove while cooking the cabbage juice to reduce the stench.
PART B: Determining the pH of Household Chemicals
1. Write the chemical and commercial brand for each of the items tested on the data sheet.
2. Fill each test tube (party cup) approximately ½ full with the cabbage juice indicator.
3. Test each chemical listed in this experiment by adding a small amount (a few mL if it’s a liquid or a dime-size amount if it’s a solid) to a fresh test tube of cabbage juice, stirring with a toothpick until a color change is observed. DO NOT add two chemicals to the same test tube of

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