Selection of Probe Location

Mixing time techniques all work on the principle of adding material to the vessel which has different properties from the bulk. Measurements are then made (usually in a controlled volume within the vessel) that show the presence of the added material. The decay of material property fluctuations is used to measure the mixing time for the system. Many of the devices used for measurement of the added liquid are intrusive, and the experimenter must try to minimize the number of probes installed in the vessel in order to  

3 Approximate Mixing Time Measurement with Colorimetric Methods 

Strong acids should always be used to avoid any buffering effects in the presence of salts from the neutralized acids and bases. With this technique, the bulk liquid can be reused repeatedly by re-adding more of the initial reactant. 

2 Iodine-Thiosulfate. The reaction between sodium thiosulfate and 

Add sufficient iodine solution to the vessel to produce an intense black color. Note the quantity used. 

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