You should be signed in to submit the Report Form.
Specify the location of the experiment.
Drag the marker to indicate the location. Remember, you can zoom into the map for a more precise location.
Date of the experiment
What drink did you choose to study? Specify the name of the drink you have tested. If you see the name of the drink in the tooltip, select it by pointing the cursor and “clicking” on it using computer mouse.
When did you measure pH?
pH beverage. The first measurement.
pH beverage. The second measurement.
pH beverage. The third measurement.
pH beverage. Average value. Learn the average pH of your drink afetr sending in your Report Form or in the “Findings”. This value will be considered as the acidity of the drink.
This field will be filled in automatically after the Report Form is submitted
What method do you determine the value of pH?
How does the pH (acidity) of your drink change over time?? What determines soda pH and its change after opening sealed container it is stored in. Do you think various ingredients that make up the drink can affect its pH and how the pH changes over time after opening sealed container with the drink?
Open the bottle or can and pour the water into a prepared clean beaker.
Measure the acidity of the water. Measurements can be taken using a digital pH sensor, a laboratory pH-meter, litmus paper (strips) or other indicators of acidity.
If you are using a digital sensor or laboratory pH-meter, it is desirable to pre-calibrate them (see the Project Getting on the Same Page)
Repeat the test three times, each time washing the sensor thoroughly first, then wiping it dry. Enter all three measurements in the final report. The program will automatically calculate the average value, summing these three values of acidity and dividing the total by 3. The resulting value will be considered the average acidity. (You will see the results when you send the reports. These can also can be viewed in the “Findings” section in your profile after it is sent.)
If you use a litmus test measurement of acidity, follow the directions of the manufacturer, A measurement using a litmus test, as in the case of sensors, should be repeated three times and all three values entered to make a profile.
After measuring, leave the soda container open.
An hour later, if possible, or at the end of the lesson, repeat the measurement according to the method described in Sec. 2 of this Protocol. After these measurements, continue to leave the bottle open.
The third measurement should be taken the next day after a bottle or can has been opened. The measurement procedure is the same.
For each measurement, fill in the Report Form, indicating when the measurement was made. If you decide to test several different brands of soda, then enter the results of each study in a separate Report Form.
Follow the progress of the project, and participate in the discussion of the results obtained by other contributors.
Observe safety precautions when working with the pH meter as described in the user manual.