Look at the amount/volume of Ferric Amm cirtrate you add compared to the Pot ferricyanide! It takes up a lot more space!
Emil, how do you measure the solutions? (a.) Drop count (by pipette) or (b.) proper ml (by syringe)? If the former - (a.) that is... - mind that different solutions' specific gravity and surface tension are also different, therefore the drop volumes are different - hence the different rate of consumption... If the latter, I can't think of anything other than the phenomenon may be caused due to different vapor pressures (highly affects evaporation speed / rate) of the solutions. (But, most probably that can be omitted if you aren't using very large containers / small amounts of solutions and I highly suspect it would cause a significant difference...)
???
Regards,
Loris.
I use a small mesuring beaker/glass (I think it is the name).
So I could just be unprecise, but why be that on the same chemistry every time.....
...
You guys ever hear of density?
Whenever you mix up a solution of ANYTHING, the density changes from 1.0 (water at 20 deg C roughly) to something else that may be lower or greater than 1.0. That is why in exact photographic work, we measure things by weight or use solutions made to a volumetric standard. In other words, you do not add 100 ml of water, you dilute to 100 ml with water, or you dilute to 100 g total with water, using whatever method applies.
PE
... In other words, you do not add 100 ml of water, you dilute to 100 ml with water, or you dilute to 100 g total with water, using whatever method applies.
PE
Are you measuring solutions in two separate beakers and pouring them together into a third or are you measuring 100 ml. of the first solution into a beaker then filling with the second solution up to 200 ml.?
Try this experiment: Get some 90% isopropyl alcohol (from the drug store) and measure 50 ml. into a beaker or graduate. Next, using a second container, measure out 50 ml. of plain water. Pour them together. Note the volume of the combined solutions.
You would expect the volume to be 100 ml. but it's not. It will be less.
The reason is because the molecules of water and alcohol are different sized. The molecules of alcohol slip into the spaces between the water molecules. It's similar to what would happen if you poured a bucket full of sand into a bucket full of marbles. The total volume will be less because the sand is going between the marbles.
The answer would be to measure two solutions separately and pour them together into a third container.
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