Reflection by: Nurzahidah binti Zamat
Before conducting this experiment, I never know that we can actually made our own indicators by using natural resources, for example flowers. Common indicator that we always used in the lab is phenolphathalein that turns pink in alkaline/base solution. In this flower and purple cabbage indicator, it have different colour depend on the concentration of hydrogen ion or hydroxide ion in any solution. Therefore we can differentiate the pH of the solution depend on the colour of our indicator changes.
After that, we learn the pH of different household items that we bring. Surprisingly, the hair gel show the acidic properties as the colour changes to purple after the indicator was added.
In this project, we work as a team and manage to finish the project within two hours. I hope that in the next project and experiment, we can maintain this and produce high quality outcome.
Reflection by: Aqmarollah bin Mohd Nasip
By doing the project,
I am able to make an pH indicator by using purple cabbage and flower. I do not
know that the samples are able to make as an indicator. We also can test the
indicator with our household materials. The indicator will change colour when
mix with the materials. Correct way conducting the project also be learned from this experiment.
We can know some of our household materials are acid,
neutral and base. This can raise awareness among us about the usage of
household materials. Hair gel is acid in our experiment but maybe it is not a
dangerous or strong acid, therefore it can be used in our daily life. I also
learned to work in a group. We divide task among us to perform the project.
This will save our time and energy also.
As a conclusion, I hope I will be able to improve my skill
in doing lab experiment and project. Accurate result will be get when doing the
experiment properly.
Reflection by: Afifah Syafikah binti Azizan
From this Making pH indicators
experiment, what did I get out of it is I know that from common our flower,
fruits or vegetables can be a natural indicators of pH levels. Our group use
extraction from hibiscus flower to compare with red cabbage extraction that prepared
by lab assistant. I also know how to make the different concentration of acid
and base. Then with the different concentration of acid and base, our group can
indicate the level of pH after drops of both extraction was added. The red
cabbage indicator did change colours, greens or blue for bases and red or pink
for acids. I was shocked at how fast the colours changed and how
delightfully brilliant and beautiful the colours were! While the
indicator from hibiscus flower not all changes to greens or blue for bases and
red or pink for acids.I assume maybe hibiscus flower extraction not suitable to
make pH indicator or maybe we make an error during prepared the different
concentration. Then I also can identified what my household chemicals pH. Our
group brought five household chemicals which are toothpaste, shower gel,
custard flour, salt and hair gel. Our group also use both natural indicator to
indicate our sample. The result for both natural indicator quit same and almost
our household chemicals are bases and only hair gel is acid which have pH lower
than 7. This is a fantastic way to introduce children to acid
and base chemistry so they already know about acid and base before learn it
more at school for their general knowledge.
