lab 5 Kitchen Chemistry Lab REVISED BSIS

Acids have a ph which is less than 7 and bases have a

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Acids have a pH which is less than 7, and bases have a pH which is greater 7. Many times, acids will have a sour taste. Some acids are very strong, such as sulfuric acid and nitric acid, and can cause skin burns. Others are much weaker and therefore safer. Most foods that we eat are acidic. Bases usually taste somewhat bitter and feel slimy or slippery. Basic cleaning substances are effective at cleaning fats and oils. Strong bases are also not safe to handle. Drano type substances (sodium hydroxide) are strong bases that eat away at clogged drains. Acids and bases react together to produce a salt and water and often have very strong reactions. pH indicators , sometimes called acid-base indicators, are chemicals which change colors in the presence of an acid or base. The color change is reversible. We will make our own pH indicator and test household liquids and chemicals. We are making an indicator using red cabbage juice, which is a natural pH indicator. The chemical that is responsible
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for the red color in cabbage and many other fruits, vegetables and flowers is in the anthocyanin family. What you need: *Red cabbage *Chopping knife and cutting board or food processor *Coffee filter and strainer *2 large bowls and a spoon *boiling water *well plates or white ice cube tray *tap or distilled water *baking soda (1 tsp dissolved in ¼ cup of water) *vinegar, undiluted *laundry powder (1 tsp dissolved in ¼ cup of water) *lemon juice, undiluted *sprite or 7-up type soda, undiluted *milk, undiluted Procedure To make the red cabbage indicator: 1. Finely chop the red cabbage. The finer you chop the cabbage the better. 2. Put the chopped cabbage in a large bowl and pour just enough boiling water to cover the chopped cabbage. Be careful not to burn yourself! Stir carefully to release more of the red indicator. Let soak for a while. The longer you can soak the cabbage, the more pH indicator you will extract.
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  • Spring '13
  • john
  • pH, red cabbage indicator

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