PH balance of household items

1. PH balance of household items

2. Materials Red Cabbage Lime and Baking Soda Handsoap Vinegar

3. procedures Strip 1 leaf from a red cabbage. Fill a blender half full with water. Blend the leaf 30 seconds. Filter the liquid so that only purple liquid is left. Pour the liquid into 2 clear bottles.

4. Procedures • The purple liquid is ready to act as a base for testing the pH balance of the various household items. • Mix vinegar, baking soap, lime juice and handsoap into the purple liquid. • Record down the changes when each item is mixed into the • purple liquid.

5. Click on picture to play video The purple liquid turns red after vinegar is poured into it.

6. Click on picture to play video The purple liquid turns blue after baking soda is added into it.

7. CLICK ON picture TO PLAY video Adding baking soda to red vinegar solution turns the liquid back to bluish green

8. Click on picture to play video Adding lime juice to baking soda solution turns the liquid to red.

9. click on picture to play video Adding hand soap to the purple liquid does not change the colour.

10. Results of experiment

11. How does it work? • Some substances are classified as either an acid or an alkaline. Acid has a low pH and alkaline has a high pH. For reference, water (a neutral) has a pH of 7 on a scale of 0-14. We can tell if a substance is an acid or an alkaline by means of an indicator. An indicator is a chemical that changes colour if it comes in contact with an acid or an alkaline. • As you can see, the purple cabbage juice turns red when it is mixed with something acidic and turns blue/green when it mixes with something alkaline. Red cabbage juice is considered to be an indicator because it shows us something about the chemical composition of other substances. If there is no change in colour, then the substance we are testing is probably neutral, like water. • Red cabbage contains a water-soluble pigment called anthocyanin that changes colour when it is mixed with an acid or an alkaline. The pigment turns red in acidic environments with a pH less than 7 and the pigment turns bluish-green in alkaline (basic) environments with a pH greater than 7.