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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: kyle106 on March 04, 2015, 09:51:24 PM

Title: Endothermic Reaction Rate Constant
Post by: kyle106 on March 04, 2015, 09:51:24 PM

Hi,

So I have been trying to determine the reaction rate constant for the reaction of Barium Hydroxide Octahydrate and Ammonium Chloride (Ba(OH)2*8H20+2NH4Cl = BaCl2*2H20 + NH3 + 8H20). I have checked every online database I could find (NIST Kinetics, etc.) and have had no luck. Additionally, I have checked in the Perry Handbook and was not able to find anything in there either (I may have just missed it).

My background is in Mechanical Engineering, so this is a bit outside of my knowledge base. If someone happens to know where I can find this information, I would greatly appreciate the help. I am attempting to use COMSOL for some simulations, and obviously, I will need the appropriate forward rate constant of the reaction to get any meaningful results.

Thank you in advance for your help. I appreciate it.

Title: Re: Endothermic Reaction Rate Constant
Post by: Irlanur on March 05, 2015, 02:48:15 AM

In solution?

Title: Re: Endothermic Reaction Rate Constant
Post by: kyle106 on March 05, 2015, 09:53:37 AM

Quote from: Irlanur on March 05, 2015, 02:48:15 AM

In solution?

I'm not 100% sure what you mean, but I don't think so. I am physically mixing granular Barium Hydroxide with granular Ammonium Chloride to produce solid barium chloride, ammonia gas, and water.

Title: Re: Endothermic Reaction Rate Constant
Post by: Irlanur on March 07, 2015, 09:21:07 AM

Then good luck with finding reaction rate constants. You won't find any.

What do you want to simulate?

Title: Re: Endothermic Reaction Rate Constant
Post by: unsu on March 09, 2015, 02:37:00 PM

It is not that easy.. A solution is a homogeneous mixture (one phase): this is straightforward. But when you mix two solids, the rate will strongly depend on the surface area of contact, on how rapidly you mix/stir the reactants, etc. And afterwards, the reactants will start dissolving in the water produced - so the conditions change, etc. I doubt you could find any information on the reaction rate for this system, it won't be reproducible. You can study your own system and consider all the factors.

Title: Re: Endothermic Reaction Rate Constant
Post by: kyle106 on March 18, 2015, 04:14:14 PM

Quote from: unsu on March 09, 2015, 02:37:00 PM

It is not that easy.. A solution is a homogeneous mixture (one phase): this is straightforward. But when you mix two solids, the rate will strongly depend on the surface area of contact, on how rapidly you mix/stir the reactants, etc. And afterwards, the reactants will start dissolving in the water produced - so the conditions change, etc. I doubt you could find any information on the reaction rate for this system, it won't be reproducible. You can study your own system and consider all the factors.

I was afraid that might be the case. Thank you for your insight!