system
Given the following post, respond as if you're commenting on Reddit:
human
If I brew coffee with twice as much water but the same amount of grounds, how much more (if any) caffeine will be in the resulting pot?

My intuition says it would contain somewhat more but less than twice as much caffeine. Is that right? Does anyone have a better idea of where in that range you would fall?
gpt
It will have almost no effect on the amount of caffeine in the water.  Caffeine has a very high solubility in water, especially hot water, so the limiting factor isn't the amount of water used, but the amount of coffee grounds added.  Even at room temperature, one cup of coffee with its ~100 mg of caffeine is only around 2% of the saturation level.  That's a good thing, because a cup of saturated caffeine solution (5 g of caffeine in 8 oz) is nearly enough to kill you.