Roger Frost: science, sensors and automation

Tagged: pH sensor

science experiments

thermometric titration

Thermometric titration As acid reacts with alkali the pH changes and heat is evolved. This heat of neutralisation can be easily monitored using sensors – to produce a graph of temperature and pH against...

science experiments

acid-base titration

Acid-base titration As acid drains into alkali the pH changes. This can be monitored using a pH sensor to instantly produce a graph of pH against volume. The volume of acid added is entered...

science experiments

respiration; germination; fermentation; anaerobic & aerobic

When living things respire they use up oxygen. This can be monitored using an oxygen sensor. The living thing can be a plant, animal or microorganism. Maggots, locusts, or yeast are often used and so can pond-weed. If you use Elodea, its container should be kept in the dark or wrapped in foil.
It is also quite easy to show how temperature affects the rate of respiration
– however, in this example, the oxygen sensor should be able to compensate for its own response to temperature changes.

science experiments

photosynthesis – measure oxygen or pH

Sensors can be used to monitor photosynthesis. They can show that as the light level increases, the oxygen level will also increase. It is also possible to show the effect of carbon dioxide levels (as added hydrogen carbonate solution) and to show the effect of coloured light.

science experiments

lipase and milk fat

Fats, such as the fats in milk, need to be digested by your body. They are broken down into fatty acids and glycerol by an enzyme called lipase. You can do this in the...

science experiments

fermentation

In the manufacture of yoghurt, bacteria turn lactose into lactic acid. The acid denatures or spoils the milk protein and sets it solid. In the process, the milk starts to taste sour and its...

science experiments

changes in an aquarium

Life in any aquatic habitat has to be supported by oxygen. We are all too familiar with rivers and streams where the oxygen supply has been exhausted and the river dies. The production and...

handling data from experiments

pH data on souring milk

The label on my milk bottle tells me how long the milk will ‘last’ at different temperatures. What do they measure to make this assessment? Is it the pH? I summoned patience, collected a glass...

science experiments

measure lipase enzyme activity

If you’ve a couple of pH electrodes and sensors, the following is one of the most successful enzyme measurements I’ve tried. Before bothering further, connect the pH electrodes to a data logger and ensure...

schools technology

how to store a pH probe

I read somewhere that pH probes do not last forever and that may be so. It was certainly true for the draw full of pH probes, all left to dry, that I found and...

science experiments

acid-base titration

As acid drains into alkali the pH changes. This can be monitored using a pH sensor to produce an instant graph of pH against volume. The easy way of doing this is to not...

schools technology / science experiments

oxygen and pH sensors

oxygen sensor Sensor is used in conjunction with an oxygen electrode. Good for demonstrations where you monitor photosynthesis, fermentation or where you re-breathe the air in plastic bag.  Before you use the electrode for...