Reagent drop size

[xDom]

Has anyone found a variation in results as the reagent bottle comes to an end.
I had a chlorine titration reagent that was almost empty, I was getting 12 drops before the colour change happened.
I ditched the nearly empty bottle and opened a new one, it only took 10 drops before the colour changed.

Is this something that anyone else has noticed?

 

[AW139]

Were the expiry dates the same on both bottles?

 

[an1vrsy]

I buy the Taylor fas-dpd titrating reagent in the 16 oz size bottle. I then fill my 2 oz fas-dpd reagent bottle and test from that. However, the drop size seems to change when the 2 oz bottle gets low. When I fill it back up the drops are back in line to what I expect.

For me, is it the weight of the fluid when the bottle is upside down?

 

[xDom]

Were the expiry dates the same on both bottles?

Good point. The bottle I threw out was only bought about 8 months ago so it probably would’ve been ok

 

[duraleigh]

The best way for drop size accuracy and repeatability is to let the drop gently fall from the tip. It's a little slow but don't push the drop out with pressure.............let it form on the tip and allow it to fall off.

 

[AQUA~HOLICS]

It’s been years, but the class I attended from Taylor advised to let the bottle relax in between each drop.