exp 7 Flashcards
An ______ is an organic compound added to a solution to visually determine a color change
indicator
For acid-base titration, the indicator commonly used is a ____ or ____ that is highly colored
weak acid, weak base
Synthetic indicators are ________, _____, _____, ______, etc.
phenolphthalein, methyl orange, bromothymol blue, congo red
________ are derived from the extract of plant leaves
Natural plant indicators
______ can produce explicit colors in acidic or basic solution
Natural plant indicators
Since indicators is an acid or base, the amount added should be kept ____ so it will not contribute to the pH of the solution and so that only small amount of titrant will be needed to cause change
minimal
5 reagents in exp 7
- alum crystals (powdered)
- distilled water
- extract of purple camote leaves
- phenolphthalein
- bromothymol blue
17 materials in exp 7?
- amber bottle
- beaker, 250 ml
- heating set up
- litmus paper, blue and red
- mortar and pestle
- buko juice
- pH paper
- stirring rod
- test tube, 10 pc
- tap water
- vinegar
- soft drink
- baking soda
- mouthwash
- toothpaste
- shampoo
In heating the mixture of purple camote leaves and distilled water, until what temperature (ºC) should we boil it?
90 - 95ºC
Color scheme in exp 7:
Red to pale red
strong acid
Color scheme in exp 7:
blue
weak acid
Color scheme in exp 7:
green
weak base
Color scheme in exp 7:
yellow
strong base
