Acids and bases

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Edit   Delete - Last Modified By: rdu at 10/04/2015 2:21:38 PM

Spend time researching the following questions and record your answers:

1. What are some of the words you think of when talking about acids?

2. Can you eat an acid?

3. You may have heard of "Antacid" tablets/liquids on the TV. What do you think these are? What do you think they do?

Edit   Delete - Last Modified By: rdu at 10/04/2015 2:26:44 PM

Here are some resources to read through about the taste of acids and bases, and how stomach acids work:

Edit   Delete - Last Modified By: rdu at 14/04/2015 11:35:13 AM
Edit   Delete - Last Modified By: rdu at 10/04/2015 2:29:30 PM

Another experiment to try at home is to make your own red cabbage pH indicator. You can use the indicator to investigate the pH of substances around your home. Some items you may wish to check are:

  • toothpaste
  • vinegar
  • shampoo
  • conditioner
  • soap
  • detergent (kitchen and laundry)
  • lemon juice or other juices
  • tea or coffee
  • honey

You may also wish to try testing some cleaning products you find at home, but beware to follow the handling advice outlined on the bottle as many cleaning products can be corrosive. NEVER allow these substances on your skin or in your eyes. Wearing gloves and glasses is highly recommended.

Edit   Delete - Last Modified By: rdu at 10/04/2015 2:32:26 PM

Watch the clip below which explores the use of red cabbage as a pH level indicator. Red cabbage juice has a neutral pH level (pH=7).

Edit   Delete - Last Modified By: rdu at 14/04/2015 2:47:33 PM

Write dot points on the following four topics:

1.  acids - including a chemical definition and the types of reactions that can occur with acids. Can acids be dangerous or safe - how? Make a list of 5 weak/safe acids and a list of 5 strong/dangerous acids, and where they can each be found.

2.  bases - including a chemical definition and the types of reactions that can occur with bases.  Can bases be dangerous or safe - how?  Make a list of 5 weak/safe bases and a list of 5 strong/bases, and where they can each be found.

3.  pH indicators - including a definition and 5 examples.  The red cabbage indicator is a naturally occuring product and there are a variety of different products that can be used to test pH.  List 5 examples where pH is important and would be tested.

4. pH scale - draw the pH scale in your workbook from 1 to 14, and record where each product tested in the red cabbage indicator experiment is on the scale.  (If you do this experiment at home, you may want to add further products to this diagram).

 

 

Edit   Delete - Last Modified By: dna at 23/01/2014 5:23:38 PM

Prior to class:

1. Read the attached information about acids and bases.

2. Read through the practical experiment

 

After class:

1. Test your indicator on a number of household items. Use the list from "Anywhere Anytime Learning" above as a guide.

Edit   Delete - Last Modified By: dna at 25/01/2014 1:37:12 PM
Edit   Delete - Last Modified By: dna at 25/01/2014 1:37:56 PM