Question

since Allura Red is red in color, why did we choose to use monitor the wavelength of 470 nm? does allura red transmit or absorb red light ?

you are given a colored solution that is labeled 1M. you need to prepare a solution from this that is 0.5M decribe your procedure in details

Answer 1

Answer:-

1) Allura red is red in colour because it absorb the light in the wave length range of blue colour (i.e, 470 nm) and reflects the red wave length. hence we choose the wave length of 470 nm to monitor.

Thus if a substance is red in colour it absorbs all other wave length except red.

2) In order to decrease the concentration to half, simply increase the volume to double.

for example, if we have 250 ml of 1m then solution, we can add distilled water upto 500 ml. Now the concentration is 0.5m.