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[drbdrb]

what is the physical test to make a dry pure sample of salt from hydrochloric acid and sodium hydroxide i.e. step by step instructions please?

[frosch45]

All you have to do is add a quantity of NaOH to HCl and your salt will precipitate. Do this until the reaction stops and then in a fume hood evaporate your leftover solution. Do you still need us to tell you 1) Fill a beaker with HCl. 2) Add your NaOH...etc?

[big314mp]

You should add equal moles of NaOH and HCl, btw.

[jdurg]

Yes, but you'll still have water present if you do this in an aqueous solution. I would work in a vacuum chamber where all air is replaced with nitrogen gas. This will prevent any water from being present and any CO2 from turning the NaOH into NaHCO3. Then, take a very fine powder of NaOH, and place a great deal of HCl gas into it. After some time, the HCl will react with the NaOH forming NaCl and some H2O. So in reality, you can never have absolutely dry NaCl since the reaction itself produces an equimolar amount of H2O.