Hi Phil,
Thanks for the info but It is not a typo error, 214.02 divided by 6 is indeed 35.67. That is if you are preparing 1 N solution, since we were preparing a 0.1 N solution, then it should be 3.567 g. Anyway, we have added water to KIO3 crystals in 1 L vol flask, its just that what I wrote was dissolve the KIO3 in 1 L of water (Dissolve-I mean adding water to the crystals). Also, out of curiosity and for my information, whats the difference between the two, dissolve the kio3 in 1 liter of water and you add water to the kio3 until you get 1 liter, in terms of accuracy in our analysis and safety?
thanks in advance......
emil
*********** REPLY SEPARATOR ***********
On 05/10/1999, at 9:50 AM, Phil Crepeau wrote:
>hi,
>
>do you have a typo here? the molecular weight of potassium iodate is
>214.02. that divided by 6 is 35.67 not 3.567. also, you don't dissolve the
>kio3 in 1 liter of water. you add water to the kio3 until you get 1 liter.
>that's a subtle, but important, difference.
>
>phil crepeau
>
>-----Original Message-----
>From: emilio cagmat [mailto:[log in to unmask]]
>Sent: Friday, May 07, 1999 4:30 PM
>To: [log in to unmask]
>Subject: Re: [TN] Black oxide process
>
>
>Hi Motoyo-san and Rudy,
>
>Your an expert in this field I believe. We are evaluating a new chemical for
>our post dip-black oxide precess, a non-amine and borane reducing agent
>(Morton Chemical). During the course of our evaluation, we encountered
>problem in our chemical analysis, since our lab don't have prepared solution
>for the analysis of the new chemical. Analysis procedure requires as to
>prepare 0.1 N Potassium iodate (KIO3), From MERCK, it stated to dissolve
>3.567 g KIO3 in 1 L water, that is molecular weight of KIO3 divided by 6. I
>just wanted to know the reduction half reaction equation of this iodimetry
>analysis, we have some problems encountered when compared to supplier's
>analysis. I don't have any idea also on what particular chemical, (and its
>concentration) are we analyzing.
>
>Emil
>
>
>*********** REPLY SEPARATOR ***********
>
>On 05/07/1999, at 1:31 AM, <Rudy Sedlak> wrote:
>
>>For Everyone's Information:
>>
>>Hitachi owns the world wide patent rights on the use of amine borane
>>compounds on reducing oxides to prevent Pink Ring.
>>
>>And further, there is one other treatment for preventing Pink Ring, (with
>>oxide), and that is MacDermid's.
>>
>>The other way that people use to treat Copper to promote bonding is to use
>>immersion Tin plus a Silane treatment. This process is called Durabond,
>and
>>I think it is owned by McGean Rohco.
>>
>>In certain circumstances, it is possible to use bare Copper with no
>>treatment, also.
>>
>>Most of the time, the PCB customer defines what they want, and the
>fabricator
>>must do what they want.
>>
>>In the US today, most of the PCB multilayers are done with oxide, and most
>of
>>those are treated with an amine borane reducing agent.
>>
>>Rudy Sedlak
>>RD Chemical Company
>>
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