Homework Help

How is the completeness of separation of benzoic acid and crystals from NaCl known with...

user profile pic

cheereyl | Student, Undergraduate | eNotes Newbie

Posted December 8, 2008 at 10:36 PM via web

dislike 0 like

How is the completeness of separation of benzoic acid and crystals from NaCl known with the addition of Silver Nitrate?

what are the methods of inducing crystal formation from solution? (benzoic acid,NaCl,Silver Nitrate and water)

Give atleast 3 characteristics that a good solvent for crystallization must possess..

Thanks..God Bless You..=)

1 Answer | Add Yours

user profile pic

giorgiana1976 | College Teacher | Valedictorian

Posted December 20, 2008 at 2:15 AM (Answer #1)

dislike 0 like

AgNO3 + NaCl ----> NaNO3 + AgCl

After the reaction between NaCl and Silver Nitrate, the results are a precipitate of AgCl and aqueous NaNO3.

Silver Nitrate does not react with Benzoic acid.

Sodium benzoate reacts with Silver Nitrate but it will be less reactive in comparison to NaCl and will not precipitate.

 Good crystallizing solvent characteristics:

  • The solid should be very soluble in the recrystallization solvent at high temperatures.
  • The solid should be insoluble in the recrystallization solvent at room temperature or lower temperatures (i.e., an ice bath, 0°C).
  •  Crystals should be obtained from the solvent as it cools.
  • The solvent should have a relatively low boiling point so it can easily be removed via evaporation

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes