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Looking up the Ph!. Josue Torres Period:3rd Chemistry Extra Credit lab 5/28/2013. Purpose. To measure the pH of various household materials by using a natural indicator to make an indicator chart. Materials . Knife Red cabbage leaves 1 cup measure Hot water 2 jars clean white cloth
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Looking up the Ph! Josue Torres Period:3rd Chemistry Extra Credit lab 5/28/2013
Purpose • To measure the pH of various household materials by using a natural indicator to make an indicator chart.
Materials • Knife • Red cabbage leaves • 1 cup measure • Hot water • 2 jars clean white cloth • Teaspoon • Tape • 3 sheets of plain white paper • Paper • Marker • 10 clear plastic cups • White vinegar • Backing soda • Household ammonia • Various household items • Ruler
Procedure • Put ½ of finely cut cabbage leaves into one jar, then add ½ of hot water. Stir and crush the leaves while stirring with a large spoon • Get a clean cloth and put it in a clean jar. ( that’s your natural indicator) • Tape 3 sheets of white paper from end to end, Draw a line down the middle and number it from 1 to 14. this is your pH scale • Pour about 1-cm of your indicator into three clear cups. Then to one you add several drops household ammonia, then to the second one you add several drops of vinegar and then to the third one you add a pinch of backing soda. Then place them on the pH scale where they correspond. • Repeat step 4 for some household items, table salt, milk, lemon juice, laundry detergent, dish detergent, mouthwash, toothpaste, and shampoo.
Conclusion/Analyze • While I was doing this lab I was able to refresh my memory and good back onto chapter 19. This lab was very useful because I was able to use it like a study guide for the final for Chapter 19 acids and bases. I also discover that when you put red cabbage in water the water turns purple. That was something new to me because I have never done this experiment. I also learn that if you put to much of the items the color might turn a non accurate color. • The color on the indicator for acidic was a dark red orange, then for neutral it was like a lime green with yellow in it, and for the basic it was like a blue violet. • I really think that one of the chemical change that occurred while doing this lab experiment was the transformation from on color to another. • While I was finding the pH for each household items all the items that were use for cleaning or for personal hygiene , they were mostly all basic expect ammonia. Mostly all of them landed around 7-9 on the pH scale. STD: 5d. Students know how to use the pH scale to characterize acid and base solutions
