[ARC5] batteries message Glacial acetic acid eye protection. warning

[Richard Knoppow]

     Its a good general rule to add the material to the water but 
not all materials are exothermic, for instance sodium thiosulfate 
(hypo) is endothermic and can be used to cool water. In 
photography the most common exothermic materials are sulfuric 
acid and sodium hydroxide. Either can cause boiling and 
splattering and can cause great damage if they get on you. Advice 
below is good and should be followed.
    I should note that drain cleaners, like crystalline Drano, 
are among the most dangerous substances one can find in a house. 
Drano is sodium hydroxide with aluminum chips. When water is 
added the hydroxide reacts with both water and aluminum and boils.

On 6/12/2018 11:20 AM, Peter Gottlieb wrote:
> Sorry yes people should be careful. I work with strong chemicals and understand the hazards and how to be careful and safe but sometimes forget that this is not the case for everyone.
> 
> Treat concentrated acids with extreme respect, wear gloves and a face shield, and remember when diluting to add acid to water not the other way around, etc.
> 
> Peter
> 
>> On Jun 12, 2018, at 1:55 PM, Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:
>>
>>    Pure acetic acid, often called glacial acetic acid because it freezes at a fairly high temperature, is corrosive and should be kept of the skin and out of your eyes. It is a weaker acid than sulfuric or nitric acid. In photography it is usually diluted to 28% as a stock solution and then diluted further for use. Most stop baths are about 2%. White vinegar is about 5% acetic.
>>    Vinegar is useful as a cleaner and neutralizer for alkaline materials. It can itself be neutralized by a solution of baking soda (sodium bicarbonate).
>>    A paste of sodium bicarbonate is useful for cleaning and neutralizing acidic materials such as spills from auto batteries. It should then be rinsed off with water.
>>
>> On 6/12/2018 1:52 AM, Ed Sharpe via ARC5 wrote:
>>> It
>>>   is dangerous. Be careful. The concentrated form of this will ruin your
>>>   eyes.
>>
>> -- 
>> Richard Knoppow
>> 1oldlens1 at ix.netcom.com
>> WB6KBL
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> 

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL