Organic Matter and pH

Biology Proyect


Reyes Martínez

Olga Jimeno

Inmaculada Jumilla


We measure the pH and organic matter in the Guadalquivir River Project.

To measure pH we had to put in the water test strips, depending on the colour takes a different value.

To measure the organic matter, we had to be measured in river water (10 ml) add 2 drops of the solution of potassium permanganate and 5 drops of sulfuric acid.


To determine the organic matter added to the sample water with potassium permanganate (KMnO4) in the presence of sulfuric acid (H2SO4) that acts as catalyst.


• 2 test tubes

• 2 plugs

• KMnO4

• H2SO4

To determine the pH put in the river´s water the test trips, and depending of the color, it takes different value


•Test trips

Organic Matter



The results of our biology proyect:

Organic Matter:

The water sample changed the colour in less than 3 minutes; so the value is about 3.


The values of pH of the Guadalquivir river water is between 7 and 8.


Organic Matter:

We could check that there was organic matter throughout the course of the river Guadalquivir, because the water sample changed color very quickly.


We could check that the pH of Guadalquivir river is neutral.

Thus river water is habitable for most fish and plants who can live normally.