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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: nemzy on November 08, 2004, 02:17:39 AM

Title: acids, bases, etc
Post by: nemzy on November 08, 2004, 02:17:39 AM

Suppose u let an acid sample sit for a week, does it lose weight after a period of time?  and a base sample gain weight after a period of time?  why is like this?  and when a sample gains weight, the melthing point rises.  is it because of the increased intermolecular forces? thanks

Title: Re:acids, bases, etc
Post by: Mitch on November 08, 2004, 03:29:36 AM

Something might be desolving in your samples. Did you seal your samples or leave them open to air?

Title: Re:acids, bases, etc
Post by: ssssss on November 08, 2004, 03:38:43 AM

Quote from: Mitch on November 08, 2004, 03:29:36 AM

Something might be desolving in your samples. Did you seal your samples or leave them open to air?

I agree.Some adition reaction is taking place that is increasing the weight of the solution.

Title: Re:acids, bases, etc
Post by: limpet chicken on November 08, 2004, 04:31:25 AM

I imagine it would depend on the acid and the base, some acids, especially the halogen acids are volatile and will evaporate, whilst sulfuric, selenic and telluric acid are very high boiling and greatly less volatile.

Some bases, the alkali hydroxides in particular are very hygroscopic and will absorb atmospheric water, coult this perhaps be the cause?

Title: Re:acids, bases, etc
Post by: nemzy on November 08, 2004, 04:41:11 AM

i left my samples open in my lab drawer

Title: Re:acids, bases, etc
Post by: dexangeles on November 10, 2004, 01:49:51 AM

as specified already, you have to tell us what kind of acid or base you have
that makes a big difference, but seems like mad scientist got your answer already