DrDAQ is a versatile instrument that connects to the USB port of any PC. Using the supplied PicoScope software it can be used as an oscilloscope, spectrum analyzer and signal generator.
The expected results shown below are the average of a poll taken at Pico before the experiment was carried out.
|Liquid||Expected pH||Recorded pH|
Warning: NEVER drink laboratory chemicals
The results here indicate that some soft drinks have a similar pH to acids. This does NOT mean that acids are safe to drink.
A1. We can predict that the pH of the majority of our foods and drinks will be neutral or acidic.
A2. pH = 7.02
A3. [H+] = 3.5E-6 M
Dental erosion occurs when tooth enamel (and dentine) are destroyed by the action of acid on teeth. This is a different process to the damage caused by acid from decay producing bacteria.
Unlike tooth decay, erosion affects the whole surface of the tooth. Exposure to acid over a long period of time leads to progressive loss of enamel with the effect that the tooth ‘shrinks’ and crumbles at the biting edge. Eventually the dentine is exposed leading to pain and sometimes death of the tooth.
The process is irreversible and requires expensive cosmetic dentistry to restore function and appearance.
From the results obtained here, we can see that several common drinks fall below the ‘safe’ recommended pH level of 5.5. In order to minimise damage the following dental recommendation should be followed.
After acid exposure the enamel is softened and is vulnerable. Calcium salts in saliva will remineralise and harden some of the softened enamel given time. Therefore, DO NOT BRUSH your teeth straight after drinking an acid drink as the softened enamel will be further damaged by the brushing which will speed up the process of erosion - wait at least half an hour before brushing.
The experiment requires that all the liquids under test are approximately the same temperature. They should therefore be prepared in advance. The experiment should take between 20 and 30 minutes to carry out.
This experiment was written by Pico Technology.