Convert PPM to lbs/gal

One US gallon is approximately 3.7854 liters while 1 pound is approximately 452,488.69 milligrams, therefore 1 pound/gallon is approximately 119,535.24ppm. Conversely, 1 ppm is approximately 5.12 x 10^-5 lbs/gallon. From here you should have no problem creating an excel spreadsheet to calculate your answer and plot a graph of such a chart yourself.

Every 1% of TDS works out to 10,000 ppm e.g. a 10% solution contains 100,000mg/l of TDS per liter of water, giving it a total density of 1.1 kg/liter. From here you can easily derive the SG of the brine as 1.1. Again, from this you will have no problem creating an excel spreadsheet to calculate your answer and plot a graph of such a chart yourself.

Lord Vader,

Sire,

Forgive this poor mortal but a question regarding molarity and factor of chemical specie mass?

Thy calculation as I read it (in my current befuddled state) would seem to indicate that 119,535 ppm of either lead or chloride would weigh one pound.

(as would perhaps 119,535 pounds of whatever noxious gas you breathe through thy respirator )

Please forgive my question. I have been laboring in fields of emotional labor and seem to have forgotten my quantitative chemistry. It has been a long time since I have had to do one of these, and my slide rule has been confiscated by TSA who thought it suspiciously like a light saber...

And p-please don't do anything rash to my planet, Dark Lord.

Milo

1ppm of anything is 1 mg/l, so the formula given is a general one. 1ppm of lead will therefore have the same mass as 1ppm of sodium; however, the number of dissolved lead ions will be much less than the number of dissolved sodium ions i.e. the number of moles of dissolved lead is much less than the number of moles of dissolved sodium. Just think of a 1 kg solid block of lead versus a 1 kg solid block of sodium. Both have the same mass, but the block of sodium is much bigger due to the much lower density of sodium compared to lead. Now if you dissolved both in 1 m³ of water, in both instances you will get a 1000ppm solution, but you will require a much smaller volume of lead to achieve this same concentration as compared to sodium.

I hope this clarifies things, and don't worry, I have better uses for your planet than using it for target practice _{(such as using it as a breeding ground for predatory monsters for use as biological weapons)}.