pH and Living Devices Lab Article

 ph level and Living Systems

I. Purpose: To see the effects of ph level change with an organic molecule.

II. Materials:

pH newspaper Droppers Hydrogen Beakers (50ml) Paper towels normal water

Glass stirring rods " lemon " juice forceps

III. Procedure:

Part you:

Initial pH testing

1) First use the wide range ph level paper to test the pH of the liquids given. 2) When you test out with the wide variety paper initial (which scans pH from 0-13) be sure you read the pH paper making use of the correct graph and or chart. 3) Afterwards, after you're done tests with the extensive ranged conventional paper be sure to retest the pH level together with the narrow ranged paper. 4) Complete the two tests to get:

Water, Milk, Ammonia, and Lemon drink

Part II- Testing the result of ph level change with an organic molecule. 1) Have a 50ml beaker and droppers. Count away 100 drops of milk into the beaker. 2) Retest Milk together with the appropriate marrow range pH paper

3) Record data pertaining to the thin range studying on your stand. Write findings like what do you see, or perhaps what do you smell? 4) Add one drop of lemon juice using a clean dropper. Agitate the water. Read the ph level and record observations 5) Repeat the step over until an observation alter is observed. Be sure to ask if it is a proper time to stop. 6) Remember to make use of the same 100 drops of milk throughout the experiment 7) Repeat the complete process using a new 95 drops of milk and ammonia this time around


Broad range pH

Narrow Range pH


Lemon Juice



Analysis: In this lab, one observed that stomach acids and basics affect the pH of dairy differently from a single another. For instance , the " lemon " juice provided the dairy a lower ph level because of the level of acidity of the citrus juice. Essential the milk curdled. Another example, when ammonia was added to milk in part II of the lab, the ph level level improved greatly. pH is the symbol for the logarithm with the reciprocal of hydrogen ion concentration in grams atoms...