CS: 6.2 pH value
LS: 6.2.3 Investigate the relationship between pH value and the concentration of hydrogen ions and hydroxide ions through experiment.
LO: By the end if this lesson, students will be able to:
1. Differentiate the pH value between acid and alkali by developing their own pH indicator at home.
2. Write a proper lab report based on the experiment conducted.
How do we differentiate between acid or alkali substances?
As you already learn from the previous lesson, acid and alkali can be differentiate by several characteristics of its chemical and physical properties, and that includes the pH value.
The pH scale measures acidity and alkalinity and the pH value is, numbered from 0 to 14.
The pH of a neutral substance is 7.
An acidic solution has a pH less than 7. The lower the pH, the more acidic the solution or the larger the concentration of H+ ions.
A solution with a pH greater than 7 is alkaline. The higher the pH, the more alkaline the solution or the presence of OH- ions in the solution.
A solution's pH can be determined using the Universal indicator, pH paper, or a pH-meter.
But do you know that we can actually create our own pH indicator by using ingredients that we can find at our house?. One of our author has tried creating her own pH indicator at home by using a red cabbage. Yes, you saw that right. A red cabbage. Check out the video below.
ACTIVITY:
You can try create your own pH indicator at your own home too. All you need is: red cabbage, solutions that you want to test out.
You can try using different plants as you indicator (carrots, blue pea or turmeric).
Record the process of your experiment and share your findings in the format of a lab report. This way, you can also practice your lab report's writing skill.
Share your video and your findings through the Google classroom code : szm3bhm