Do you think my Onc. Twinkle likes coffee?

[rbarata]

Couldn't find how the solotion concentration is expressed (1% in weight or volume?)

---------- Post added at 08:09 PM ---------- Previous post was at 07:18 PM ----------

Considering % in weight and water density equal to 1 a 2% solution is an expresso diluted in 4 liters of water.
I'll try it!

[rbarata]

Done!
Let's see if it works...monitoring time!

My calculations were incorrect...it should be an expresso for 50 ml of water.

[Ray]

There have been scientific studies that "proved" caffeine did not do anything helpful and others that said it was effective.

Many years ago, I collected the dregs from our morning coffee pot in an old milk jug, adding about 10% isopropyl alcohol in an effort to suppress mold growth. When poured over/into plants with bush snails about every other day for a week, it appeared to eliminate them.

[rbarata]

Hello Ray

I believe some of the variance is the results may be the result of the inaccurate concentration values. How would one measure caffeine %? I think, without an adequate lab it might be difficult.

I made my solution but I don't have a clue if it has the caffeine % I want. An expresso is just a measure as, here in Portugal, it may contain something between 80 to 100 mg per 60 ml (expresso), depending on the coffee blend.

[Orchid Whisperer]

If they are available at your local pharmacy, you could use caffeine tablets and dissolve them.

The tablets have a specific number of milligrams, easier to work out concentrations.

[Ray]

Originally Posted by Orchid Whisperer

If they are available at your local pharmacy, you could use caffeine tablets and dissolve them.

The tablets have a specific number of milligrams, easier to work out concentrations.

[estación seca]

I seem to recall caffeine doesn't dissolve too well; a little better in acidic solutions.

[Orchid Whisperer]

I don't know about acidic solutions, but caffeine is pretty soluble in boiling water (e.g., coffee), but less so in room temperature water; also see chemistry section of Wikipedia page: Caffeine - Wikipedia

---------- Post added at 08:24 PM ---------- Previous post was at 08:18 PM ----------

Originally Posted by rbarata

Couldn't find how the solotion concentration is expressed (1% in weight or volume?)

---------- Post added at 08:09 PM ---------- Previous post was at 07:18 PM ----------

Considering % in weight and water density equal to 1 a 2% solution is an expresso diluted in 4 liters of water.
I'll try it!

Easy conversion from % to mg/L (and back of course) given at table here: https://www.google.com/url?sa=t&sour...boVR9QEwatxZFy

[SouthPark]

I don't get slugs or snails in my part of the world - but saw online a product called 'sluggo'.

[rbarata]

Easy conversion from % to mg/L (and back of course) given at table here: Redirect Notice

Easy but I forgot to convert the mg of the caffeine into grs of water.