Will Mixture Ratio Change in a Tank?

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SUMMARY

The discussion centers on the use of an alcohol bottle filled with Dawn dish soap placed in a toilet tank to control the release of soap during flushing. A 1/16 inch hole drilled 3 inches from the bottom allows the soap to flow out when the water level drops. The primary concern is whether the soap solution will dilute with the tank water over time, especially during extended periods of inactivity, such as vacations. The consensus is that while diffusion will occur, the mixture ratio will stabilize and not significantly change overnight or during prolonged periods.

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  • Basic knowledge of toilet tank mechanics
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John Drew
My wife is wanting to place an empty alcohol bottle filled with Dawn in the toilet tank. Have a 1//16 hole drilled 3 inches from the bottom so the fluid will come out when flushed and the water level gets lower than the hole. The Dawn will stop coming out once the water refills above the hole. My question is will the solution in the bottle continue to be diluted by the water in the tank overnight. Or if we went on vacation would the two mix together and have the same mixture ratio?
 
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The Dawn will continue to come out based on diffusion.
It won't come out as fast as when the bottle was in the draining situation, which involves moving volumes of water.

Its like an insulation situation:
Heat can get through insulation at a low rate and will eventually reach an equilibrium.
However, if say you open a cooler's lid, the change will be much faster.
 
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