If my math is right, here is a rule of thumb that you can use for approximating the maximum concentration of CS when you make it...

"The maximum concentration for 1 cup of CS made at 1 milliamp for one hour would be approximately 17ppm."



Reasoning:

Each Coulomb of electricity will deposit .001118 grams of silver into solution. A Coulomb is 1 ampersecond.

For example, 1 cup of water is 227 grams. Run it for 1 hour at 1 milliamp.

Find the number of seconds:
1 hour = 60 seconds/minute x 60 minutes = 3600 seconds

Find the number of Coulombs:
.001 amps x 3600 seconds = 3.6 ampseconds = 3.6 Coulombs

Find the amount of silver released:
3.6 columns x .001118 grams/coulomb = .00402 grams of silver released into solution

Find the ratio or water to silver:
227 grams of water / .00402 grams of silver = 56467 / 1

Find the parts per million:
1,000,000 / 56467 = 17ppm

So, the rule of thumb would be:

"The maximum concentration for 1 cup of CS made at 1 milliamp for one hour would be 17ppm."

This assumes that the current is at 1 ma from start to finish of the hour. (If it took 1 hour for the current to go from zero to 1 ma then the concentration would be approximately half (8.5ppm) for that hour, assuming that the current increase is reasonably linear at this stage.)

These values are approximate and indicate the *maximum* concentration you can get. Your effective CS concentration will be somewhat less.

Using this value you can quickly get a rough estimate of your (max) CS concentration by figuring out the number of cups in your jar, the run time in hours, and the current in milliamps.

Dan







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