[alt-photo] Re: Stoichiometry for the nonscientist

[David Ashcraft]

It seems this hole is much deeper than what was represented  
originally.  I can see why prepackaged kits are so popular.
You went from gms to ml?

On Aug 1, 2010, at 10:27 PM, etienne garbaux wrote:

> David wrote:
>
>> OK - What if I needed to mix a formula like: 180 gms potassium  
>> oxalate
>> K2C204.H2O mixed with water to make 1 liter.  I only have potassium
>> carbonate and oxalic acid on hand.
>>
>> I know that I can make this formula of potassium oxalate by mixing
>> potassium carbonate and oxalic acid; PC is K2CO3 and OC is C2H204.
>> Now how would I know how much of each of these to make up my original
>> formula?
>
> .  If you react 489 ml of 2 molar potassium carbonate 489 ml of 2  
> molar oxalic acid, then add water to make 1 liter, you would have  
> what you want.
>
> Note that if you started with potassium hydroxide (KOH) instead of  
> potassium carbonate, you would require two mols for each mol of  
> oxalic acid and the only byproduct would be water.
>
> Best regards,
>
> etienne
>
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