100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Recrystallisation of benzoic acid Questions and Answers $13.49   Add to cart
Quickly navigate to
Preview
  2.  
  3. ASID
  4.  
  5. ASID

Exam (elaborations)

Recrystallisation of benzoic acid Questions and Answers
 5 views  0 purchase
  • Course
  • ASID
  • Institution
  • ASID

Recrystallisation of benzoic acid Questions and Answers Define Recrystallisation Process of repeated crystallisation in order to purify a solid or to obtain more satisfactory crystals of a solid that is already pure. (You start with a crystalline solid, remove the impurities, and then make new...

[Show more]

Preview 1 out of 2  pages

Document information

  • September 30, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • recrystallisation of benzoic acid questions and an
  • define recrystallisation process of repeated cryst
  • recrystallisation procedure 1 dissolve in a mini

Written for

  • ASID
  • ASID

Seller

avatar-seller
Pogba119

Reviews received

Content preview

Recrystallisation of benzoic acid
Questions and Answers
Define Recrystallisation - answer Process of repeated crystallisation in order to purify
a solid or to obtain more satisfactory crystals of a solid that is already pure.

(You start with a crystalline solid, remove the impurities, and then make new crystals.)

Recrystallisation procedure. - answer 1. Dissolve in a minimum amount of hot water
2. Hot filtration
3. Cool - recrystallisation - ice bath
4. Cold filtration
5. Dry

Important point about the solubility of benzoic acid - answer Benzoic acid has a
*high* solubility in hot water and a *low* solubility in cold water.

Therefore, when a saturated solution of benzoic acid is cooled, crystals are formed.

Purpose of dissolving in a minimum of hot water - answer 1. When the benzoic acid
is dissolved in the minimum amount of hot water, then that means that the hot water
contains the maximum amount of benzoic acid.
2. This minimises the amount of benzoic acid that remains dissolved in the cold water
(benzoic acid is slightly soluble in cold water).

Benzoic acid has a *high* solubility in hot water and a *low* solubility in cold water.

Purpose of hot filtration - answer To remove insoluble impurities.
−When the benzoic acid is dissolved, the impurities that are insoluble in water
precipitate out while the pure benzoic acid and the soluble impurities become dissolved
in the water.

Hot filtration:
1. Why does it have to be hot?
2. Why do we use fluted filter paper? - answer 1. To prevent it recrystallising on the
filter paper.
2. It allows the filtration to occur faster.

Purpose of the cooling - answer To cause the benzoic acid to recrystallise

How are the soluble impurities removed? - answer When the benzoic acid
recrystallises, the soluble impurities remain in solution because they are much less
concentrated than the benzoic acid solution.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Pogba119. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $13.49. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

83637 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$13.49
  • (0)
  Add to cart