Amount of baking soda/vinegar to euthanize 20-25 baby rats?

[boadaddy]

if you dont like to break their necks and have no dry ice i would say toss them in the freezer, the cold slows them down and they go to sleep and.....well......never wake up.

Sorry bud they don't just ''go to sleep" , they have a slow painful death until their blood literally freezes. Please at least just thump them if anything? If you feel bad about cervical dislocation then you should feel horrible to just toss them in the freezer!

[kevinb]

Sorry bud they don't just ''go to sleep" , they have a slow painful death until their blood literally freezes. Please at least just thump them if anything? If you feel bad about cervical dislocation then you should feel horrible to just toss them in the freezer!

Agreed freezing to death for anything is painful. Your blood starts to crystalize while freezing...
Very painful. I've only used this method with fish and have thus changed to blunt head trama to do the job. Freezing is a horrible way to die.

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[Rhasputin]

Agreed. Freezing is not a good method of culling rodents.

Also, CO2 is NOT suffocation. They are still able to breath, but the gas that they breath makes them lightheaded, and them they pass out. While they're passed out, you give them a higher dose, and it kills them in their sleep. There is virtually no more humane way to cull at home.

[jasbus]

Back to the original question...

3 cups of vinegar to 3 or more tablespoons of baking soda should do the trick. If it's not enough, just have the ingredients ready for another batch.
Don't quote me, but I think you get roughly a gallon of Co2 gas for every cup/tablespoon mixture. More is always better, just in case my guesstimate is off....