velox
Retired
Does anyone have any info on why/how hibiscus flowers are natural indicators?
I just wrote up this practical : "Perform a first-hand investigation to prepare and test a natural indicator" and was wondering if this discussion covered all the bases. My teacher is pretty tight when it comes to practicals.....
Discussion:
There were no errors in the investigation as there was no opportunity for them to arise. We were simply demonstrating that indicators can be made from a readily available substance with basic equipment. The experiment was valid as results across the class were very similar if not identical. Some results varied from the majority as the beakers may not have been clean in the first place thus the chemical residue slightly changing the colour of the final solution. Many of the acid-base indicators are made from pigments extracted from the leaves and flowers of plants. These leaves or flowers change colour depending on whether they are in an acidic or basic solution. They are often complex organic molecules that exist in at least two different coloured forms.
TIA
I just wrote up this practical : "Perform a first-hand investigation to prepare and test a natural indicator" and was wondering if this discussion covered all the bases. My teacher is pretty tight when it comes to practicals.....
Discussion:
There were no errors in the investigation as there was no opportunity for them to arise. We were simply demonstrating that indicators can be made from a readily available substance with basic equipment. The experiment was valid as results across the class were very similar if not identical. Some results varied from the majority as the beakers may not have been clean in the first place thus the chemical residue slightly changing the colour of the final solution. Many of the acid-base indicators are made from pigments extracted from the leaves and flowers of plants. These leaves or flowers change colour depending on whether they are in an acidic or basic solution. They are often complex organic molecules that exist in at least two different coloured forms.
TIA
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