A substance that when added to water increases the concentration of hydrogen ions lowers the pH is called an acid. Ensure your processing is easy to follow and that is also includes propagation of uncertainty.
Amounts of reagents used large enough? Repeat the experiment at temperatures close to 45oC, 40oC, 35oC, 30oC The temperatures you use may differ from those by a few degrees but must, of course, be recorded carefully.
Related Interests.Place another thermometer in this solution and stand it in the water bath. At the time when all of the thiosulphate is reacted, any free iodine produced will turn starch solution added before into dark-blue, the time is then recorded. Hence, the temperature inside boiling tubes are slightly lower than that of water-bath. A substance that reduces the concentration of hydrogen ions raises the pH is called a base When the blue colour of the starch-iodine complex appears, stop the watch and record the time. Half-fill the beaker with water and heat it to between 49oC and 51oC. Impure reagents? Resting membrane potential can be changed by two factors: differences in ionic composition of the intracellular and extracellular fluids and difference in permeability of ions in the plasma membrane Marieb and Hoehn Discussion In this experiment, known amount of thiosulphate is added. Using burettes, measure out 5 cm3 of each of the potassium iodide and sodium thiosulphate solutions and 2. Use appropriate number of significant numbers.
Accurate enough? Alternatively, you may use a full-sized water bath.
Hence, the temperature inside boiling tubes are slightly lower than that of water-bath. These errors cannot be calculated and are also difficult to evaluate.