NaCl dissolved in water

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amolvaidya06
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NaCl dissolved in water

Post by amolvaidya06 » Sun Jan 28, 2007 6:26 am

In biology we learned that molecules often do not share the same properties of the individual elements they are composed of. We also learned that when table salt is dissolved in water, it breaks apart into Na and Cl atoms. Why is it, then, that when salt is dissolved in water that it still tastes salty?

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honeev
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Post by honeev » Sun Jan 28, 2007 8:08 am

The taste buds need to interact to both sodium and chloride ions at the same time in order to 'register' a salty taste.. sodium and chloride ions are still present in water only they are apart at a proximal distance.. so definitely dissolved table salt in water tastes salty...
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sdekivit
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Re: NaCl dissolved in water

Post by sdekivit » Sun Jan 28, 2007 9:35 am

amolvaidya06 wrote: when table salt is dissolved in water, it breaks apart into Na and Cl atoms.


i don't like this sentence, because atoms are uncharged and thus insoluble in water (just like molecules as I2: molecular compunds with non-polar bonds)

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Dr.Stein
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Post by Dr.Stein » Tue Jan 30, 2007 9:07 am

I think NaCl ----hydrolysis----> Na(+) + Cl(-) is much better :)
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Dustfinger
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Post by Dustfinger » Tue Jan 30, 2007 9:19 am

Hydrolysis ? Is that not something else ?
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Dr.Stein
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Post by Dr.Stein » Tue Jan 30, 2007 9:46 am

I think it is a proper word. I know that one the meaning of "hydrolysis" is "A chemical reaction that uses water to break down a compound" or am I wrong? :roll:
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Post by MrMistery » Tue Jan 30, 2007 9:56 am

from what i know, you are wrong doc. hydrolysis is indeed a chemical reaction that uses water to break down something, but water is a reactant in the hydrolysis reaction. think of the hydrolysis of an ester into an acid and an alcohol: the atoms in the water end up in the final products.

When you put NaCl into water it dissociates, i think that is the best term.. And yeah, it does not dissociate into atoms, but instead ions.
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Post by Dustfinger » Tue Jan 30, 2007 10:00 am

Yes, exactly, hydolysis is not what you mean, Doc !
And Andrew agrees.
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