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If you are looking at a iodide to iodine redox titration, the solution would turn yellow instead of blue/black. The blue/black color of the iodine-starch complex is very intense and so the end-point is sharper. Without the starch, the endpoint, when the first yellow from the formation of iodine I2, appears, is less sharp and is harder to see.
A general acid-base titration may not indicate a color change. Therefore an indicator is used. Among the most used indicators are methyl red, methyl orange and bromothymol blue.
Acid base titration: 0.1 M HCl and phenolphtaleine indicator (pH=>8 blue)
Phenolphthalein indicates red for acids and blue for bases.
An indicator that changes its colour around pH value 5 should be used in this titration. Alternatively, instead of Thymol Blue, Methyl Orange or Methyl Red may be used.
If you are looking at a iodide to iodine redox titration, the solution would turn yellow instead of blue/black. The blue/black color of the iodine-starch complex is very intense and so the end-point is sharper. Without the starch, the endpoint, when the first yellow from the formation of iodine I2, appears, is less sharp and is harder to see.
A general acid-base titration may not indicate a color change. Therefore an indicator is used. Among the most used indicators are methyl red, methyl orange and bromothymol blue.
eriochrome black T is an indicator for EDTA titration
Acid base titration: 0.1 M HCl and phenolphtaleine indicator (pH=>8 blue)
ebt is used to get the end point of reaction that is in the end point it gives steel blue colour describing that the reaction completed now
Neptune's atmosphere is made up of helium, hydrogen and methane. Neptune appears blue because the upper methane atmosphere absorbs the red spectrum from the light and reflects back the blue light spectrum from the sun back into space. Giving the impression that it's a blue planet.
You take the crayon and you press it agianst the board and then you take it back and forth and the blue magically appears.
On addition of the KI to your copper (II) solution, you formed Copper (I) iodine solid and produced the tri-iodide ion. It is the tri-iodide ion that you are titrating with the sodium thiosulfate. The tri-iodine ion is what itercalates into the starch molecules to form the dark blue color you are using as an end point in the titration. Some the the tri-iodide ion formed will adsorb to the surface of the solid copper (I) iodine formed. This must be desorbed for a complete titration. The addition of the potassium thiocyanate, displaces the adsorbed tri-iodine ion, and liberates it for titration.
Phenolphthalein indicates red for acids and blue for bases.
An indicator that changes its colour around pH value 5 should be used in this titration. Alternatively, instead of Thymol Blue, Methyl Orange or Methyl Red may be used.
Blue what ? ! ? Do you mean an object that appears blue in white light ? Such an object appears black in green light.
Neptune appears blue due to the methane gasses in the atmosphere absorbing the red light spectrum and reflecting the blue light spectrum back into space.