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Dead Freight

Can you explain me the scene of the heist, when they are replacing the methylamine  with water? because i can't understand how the water that is filling the tank wouldn't interfere with the product

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good question, goldenmoth!

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The train always uses the same route according to Lydia, all they needed was the train carriage # to steal, that's what she got at 2AM

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That doesn't answer my question.  How could Walt have known the methylamine tank would stop right on top of the spot where they burried the tanks the day before?

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They have to replace the tanker with the same ammont of liquid as the take out. By putting water on the top and taking methylamine from the bottom They will have the same ammount of liquid as before they started the heist. The water will dilute the methylamine slightly and it will appear as if china short changed them. What I wan't to know is how did they know the car with the methylamine would stop right where they dug. What if it was the last car lol?
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there was plenty of hose length in case their measurements were under/over to get back to the tanks.

this was the most stressful episode to watch!!!! I am worn out.

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There's no way they could have gotten all of the water in, even if they did only replace 1000 gal of methlamine with 900 gal of water. They didn't start pumping the water until 300 gal had been drained, and seemingly finished at the same time. Pumping water with that little motor is not going to go nearly as fast as draining straight from the bottom of a tanker.

Also if the weight of 900 gal of water = the weight of 1000 gal of methlamine, then the water is more dense and seems like it would head toward the bottom as soon as they started replacement, and therefore interfere with the product. I'm with Daniel on this one.

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Just because the product is 4% diluted doesn't mean it's ruined.  It simply means they might not produce the greatest batch of Blue Sky ever made.  For their purposes, aka the production and sale of an illicit substance, I doubt a 4% dropoff is something they'd worry about.  Right now, they seem to be in $$$ mode. 

More concerining is what Mtwkykstr said -- the time between Jesse opening the tanker up and Todd starting the water doesn't match.

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Mtwykstr wrote:
There's no way they could have gotten all of the water in, even if they did only replace 1000 gal of methlamine with 900 gal of water. They didn't start pumping the water until 300 gal had been drained, and seemingly finished at the same time. Pumping water with that little motor is not going to go nearly as fast as draining straight from the bottom of a tanker.

Also if the weight of 900 gal of water = the weight of 1000 gal of methlamine, then the water is more dense and seems like it would head toward the bottom as soon as they started replacement, and therefore interfere with the product. I'm with Daniel on this one.

Exactly this.

Walt says that 900 gal of water weighs the same as 1000 gal of methylamine. That means that water is heavier than methylamine. So if you put water into a tank full of methylamine, the water is going to sink straight down to the bottom.

The problem with that, is that they were tapping methylamine out of the freight car from the BOTTOM. As soon as they started pumping water into the freight car to replace the methylamine they were stealing, the heavier water was sinking to the bottom of the freight, and going right back out through the bottom hose, into the methylamine tank they had buried under the bridge.

tl;dr: Walt was diluting his own stolen methylamine with water!

I thought of this while watching the episode and silently SMH'd, but I didn't enjoy the episode any less. Great episode!

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I don't agree, I think your explanation would only happen if water and methylamine solution were immiscible but Walter says it is aqueous methylamine ie the gas dissolved in a water solvent so - the water being added would certainly mix with the aqueous methylamine causing the solution to become slightly more dilute.

Take a glass of water add orange squash from the top and see what happens.

A more pressing question is how the hell did they know (24 hrs earlier) where to bury the containers? Why did they measure back to that exact spot when Lydia didn't know the exact location until later that night?

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Glhtex wrote: Daniel, i think that's a good point I hadnt thought about.  They were putting the water in at the top and taking the methylamine out the bottom.  Maybe it didnt really have time to be mixed seeing as how it was a huge tanker full of it.  Or maybe we just accept it since it is a TV show. 

The train tanker contains aqueous methylamine ie methylamine dissolved in water. Methlyamine is very soluble in water. When water is added it will simply make the methylamine solution a wee bit more dilute. The solution being drawn from the bottom will become progressively more dilute but only by a tiny amount compared to the starting solution. Presumably it would still be fit for purpose otherwise Walter would have used a different plan probably happily killed the train guards.