Turn on thread page Beta

Help needed with a Chemistry experiment? Thanks. watch

    • Thread Starter
    Offline

    6
    ReputationRep:
    A housewife suspects a new, blue cake colouring called 'cake mix 2' is the same food colouring she developed at home using crushed blueberries. Plan and design an experiment to test the housewife's claim.
    You must first develop the following:
    Hypothesis
    Aim
    Apparatus and materials
    Method
    Variables (controlled, manipulated, responding)
    Expected results (include table)
    Intepreted results
    2 Limitations
    • Community Assistant
    • Study Helper
    Offline

    17
    ReputationRep:
    Community Assistant
    Study Helper
    (Original post by The_KingRaptor)
    A housewife suspects a new, blue cake colouring called 'cake mix 2' is the same food colouring she developed at home using crushed blueberries. Plan and design an experiment to test the housewife's claim.
    You must first develop the following:
    Hypothesis
    Aim
    Apparatus and materials
    Method
    Variables (controlled, manipulated, responding)
    Expected results (inclusde table)
    Intepreted results
    2 Limitations
    Hypothesis: It's the same
    Aim: Find out
    Apparatus and materials: spoon
    Method: eat some
    Expected results (inclusde table): Tastes the same
    Name:  table.jpg
Views: 65
Size:  49.5 KB
    Intepreted results: It's the same
    2 Limitation: Break dancing & woodwork
    • Thread Starter
    Offline

    6
    ReputationRep:
    If anyone could submit any useful and scientifically valid responses it would be appreciated. I'm assuming a separation technique must be used? I have just started Chemistry, so pardon the ignorance.
    Offline

    12
    ReputationRep:
    (Original post by The_KingRaptor)
    If anyone could submit any useful and scientificlly valid responses it would be appreciated. I'm assuming a sepration technique must be used? I have just started Chemistry, so pardon the ignorance.
    I have a feeling it's to do with chromatography, since it involves dyes and that's a great way to separate them. Hope this helps.
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by typicalvirgo)
    I have a feeling it's to do with chromatography, since it involves dyes and that's a great way to separate them. Hope this helps.
    Thank you for the response! I do think so as well and I'll look to reaffirm it.
    Offline

    19
    ReputationRep:
    (Original post by The_KingRaptor)
    Thank you for the response! I do think so as well and I'll look to reaffirm it.
    Not putting what level this question is aimed at makes it difficult to answer. There's no way you would be able to confirm it is the same dye without separating it (probably using a column, maybe something like Soxhlet extraction if you find a decent solvent) and then IR/NMR/UV-VIS to show it has identical structure.
    • Thread Starter
    Offline

    6
    ReputationRep:
    (Original post by alow)
    Not putting what level this question is aimed at makes it difficult to answer. There's no way you would be able to confirm it is the same dye without separating it (probably using a column, maybe something like Soxhlet extraction if you find a decent solvent) and then IR/NMR/UV-VIS to show it has identical structure.
    Thanks for answering. I've never heard of this before but I'll use this information to aid me in completing my lab. Very useful. If I do decide to use a Soxhet extractor, would it be incorrect to use chromotography? If so, why?
    Offline

    19
    ReputationRep:
    (Original post by The_KingRaptor)
    Thanks for answering. I've never heard of this before but I'll use this information to aid me in completing my lab. Very useful. If I do decide to use a Soxhet extractor, would it be incorrect to use chromotography? If so, why?
    You would probably want to do a TLC of your extract after Soxhlet to make sure it's pure. You want to use a solvent your desired product is not particularly soluble in (but still slightly soluble so the boiling solvent will carry some purified product into your RBF every cycle), and your impurities are insoluble in.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 13, 2016
The home of Results and Clearing

1,012

people online now

1,567,000

students helped last year

University open days

  1. Keele University
    General Open Day Undergraduate
    Sun, 19 Aug '18
  2. University of Melbourne
    Open Day Undergraduate
    Sun, 19 Aug '18
  3. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
Poll
A-level students - how do you feel about your results?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.