Ph determination Rebeca NavarroAbigail Guevara

Michaela Dobronski

Natural vs fabric

Materials

• Red Cabbage• Different soaps• A mortar or a blender • Alcohol• Water • Pot• pH meter

Objective • By a serious of diferent steps we will determine what is the

best form to make the cabbage juice and to calculate the level of PH(potential hidrogen ) of the food, garden and others utilities of the scale of PH.

Variables

• Manipulated: making juice of cabbage of different forms. Put it on the soaps • Resulting: what is the best form to make the cabbage juice.

The color of the soap and concentration according to the intensity of cabbage juice.

One example of Alkaline vs acid in our body • Stomach acid: the parietal

cells of the stomach secrete hydrochloric acid that bring the stomach pH to a range of approximately 1.5 to 3.0.:

• Pancreatic juices is alkaline and they are found in our body to reduce the acid of gastric juices. This happens because it have a concentration of bicarbonate ions.

EXPERIMENT

Forms to make the liquid to measure the PH Home made 1.-Boil water with purple cabbage 2.-Crush the cabbage with alcohol 3.-Let it rest for 5 hoursLaboratories made 4.- PH measure

Number 1

• BOIL WATER FORM :• Cut the red cabbage leaves • Put it in water and heat until is boiled • Separate the cabbage and the water• Let it cool

Number 2

• Crush the cabbage with alcohol• Cut some leaves of the cabbage • Put alcohol in a bowl • Mix the leave and alcohol• Use a blender or a mortar to crash them • Take out the leaves of the cabbage

Number 3

• Let it rest for 5 hours: • Cut the cabbage leaves and put it on a bowl • Pour some water• Let it rest for 5 hours

We call this technic the five hours method

Ph meter

https://www.youtube.com/watch?v=Zw2Zs5DeWMs

We will use a fabric made PH band

Test of cabbage use

We will use this ph scale

• If it is alkaline is good for the skin but if it is acid it is bad depending the part of the body.

Number 5

Number 9

Number 10

Almost neutral

NUMBER 9

Almost neutral

• Conditioner for horses

Number 11

Some how neutral

Why red cabbage can detect the PH???

• The purple cabbage has anthocyanin that are found in pigments.• When we boil, crash or let it rest the water we liberated

pigments of the cabbage and that rebelled PH• The color change is due to a structural change induced by

protonation or deprotonation of the species.

Conclusion and results

Results

• The 5 hours method is the one who reveal PH. we let it rest work very good because it have more intensity of the color and this helps us with our experiment and give us more clues.

Conclusion

• There are many forms to do this experiment. If you want to make it home made, use number 3. This liberate more the pigments reveling better the potential hydrogen. We comprobe this because in the same product is was more intense the color than the other forms

Besides

• The best soap was number 4 because is was made for babys and the care of skin. The worst one was DEJA number 1 that have a weak acid level, but still acid. The acid will dry your hands.• We recomend you to don’t use dust soaps because they are

bad for your skin.

Opinion

• With this experiment we learn how to do a measure the ph in a natural form. We learn that not all the soaps are good. This was interesting because we bring something that can only be made in laboratories and we made It in our houses.