Fish tank indicator

As pervasive as redox reactions are, however, they are certainly not all there is to chemistry. Another very common and important type of reaction is found in the acid-base reactions that occur in the air, on skin, in stomachs, in sewers, and even in swimming pools and fish tanks. The fish-tank indicator that we used to detect carbon dioxide is an acid-base indicator. It worked to detect carbon dioxide because carbon dioxide dissolved in water turns water slightly acidic. Intrigued Read on. 

Using one-cup (240-milliliter) samples of saturated baking soda solution, vinegar, ammonia, and water, you can set up the following banks of solutions and observe the colors that result when you add purple-cabbage, swimming-pool, or fish-tank indicator. 

How do we know that it was COj that caused the change Take a clean glass and prepare another solution with four teaspoons water (20 milliliters) and two drops of fish-tank indictor. Now blow up a balloon. Holding the balloon pinched shut, put the balloon on one end of a straw and put the other end of the straw down into the indicator solution. When you ease open the neck of the balloon, freshly exhaled COj from your lungs will bubble quickly through the solution and you should see the indicator once more turn from green-blue to yellow. 

Electronic humidity indicator 10- or 20-gal fish tank Test tubes... 

The application of liquid crystals to thermography is widespread, and covers areas as diverse as infant bath and feed temperature indicators, medical screening and diagnostics, nondestructive testing, thermometers for fish tanks and refrigerators, battery testing, jewellery, advertising, aerodynamics research and art. Some specific applica-... 

In a study by Smith and Davey (1993), a Pseudomonas fluorescens strain FI 9/3 was tested for its activity to exclude A. salmonicida from salmon pre-smolts with stress-inducible furunculosis. Fish were removed from a hatchery population where stress-inducible infections were prevalent and transported to the laboratory. Half of the fish were bathed in water containing strain F19/3 for 24 h at 16 °C on the day after their arrival, with the rest as the control. This was followed by administration of the stressors and each fish was held in an individual tank for 14 days to avoid cross infections. A significant reduction in the frequency of stress-inducible infections was observed in the group of fish bathed in F19/3 compared to the control group. Since it was demonstrated that strain F19/3 did not colonize the fish internally, this indicated an exclusionary effect of strain F19/3 by bacterial colonization of fish external surfaces. 

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