Topic: Water evaporation problem (Read 3981 times)

ifuller · « **on:** May 18, 2007, 02:54:34 PM »

Hello,
I am doing some experiments with measuring the amount of hydrogen produced from a combination of NaBH4 and water. I know the theoretical maximum mass of gas produced but, when measured, the total mass loss due to the gas evaporating is 3-4 times the theoretical maximum. I believe water is evaporating and this is causing the increased mass loss. Can anyone give me any suggestions on how to either calculate or estimate the water evaporation in order to find the mass of hydrogen produced? Thank you

Borek · « **Reply #1 on:** May 18, 2007, 03:43:10 PM »

Keep it cold during reaction. Or react it in reflux apparatus so that water goes back to the flask. Every estimate will be wishfull thinking IMHO.

ifuller · « **Reply #2 on:** May 18, 2007, 04:03:32 PM »

Thank you for your help. Can you be more specific about the reflux apparatus. I am not sure what that is? Thank you

Borek · « **Reply #3 on:** May 18, 2007, 04:12:04 PM »

http://en.wikipedia.org/wiki/Reflux

Third image on the right.

Topic: Water evaporation problem (Read 3981 times)

ifuller

Water evaporation problem

Borek

Re: Water evaporation problem

ifuller

Re: Water evaporation problem

Borek

Re: Water evaporation problem

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