Natural PH indicator
extraction of natural PH indicator from Apple
Published on: Mar 3, 2016
Transcripts - Natural PH indicator
•Apple (Malus Domestica) skin contains a pigment
molecule called "anthocyanin " . It is a water-soluble
pigment that may appear red, purple, or blue
according to pH. Since apple skin contains
anthocyanin that can determine the pH level of a
substance, we decided to make an acid-base
indicator out of it. By extracting apple skin, and
turning it into solution , we can test the pH of a
# 300 g apple skin (about 17 apple ).
500 ml distilled water.#
# 1 sieve .
# 1 knife .
# 1 container .
# weighing balance .
# ( test tubes – beaker – droper ).
1-slice the apple skin.
2- place the apple skin on the weighing balance.
3- make sure to have 300 g of apple skin .
4- measure 500 ml of distilled water in the
5- add 300g of apple skin and 500 ml of distilled
water into the pot .
6- boil the pot over a stove for 5 minutes.
7- turn off the stove and let the mixture cool to
room temperature .
8- pour the solution into the container through
the sieve .
9- now we have the extract
11- conduct ph test using household products .
S u b s t a n c e s p H L e v e l C o l o r A c i d B a s
V i n e g a r 2 P i n k (
Orange Juice 3 P a l e R e d (
Tomato Juice 4 R e d (
M i l k 6 M a r o o n (
P u r e W a t e r 7 D a r k P u r p l e
E g g 8 L i m e G r e e n (
Soapy Wate r 1 0 D a r k G r e e n (
A m m o n i a 1 2 G r e e n (
1 3 Green to Dark Yellow (
1 4 G r e e n t o Y e l l o w (
Table 1. Classification of the Substances Used in the Tests