Qualification > Sciences
Edexcel CHEMISTRY DOUBTS!!!!
Blizz_rb93:
How do we calculate the solubility of a substance???
Saladin:
--- Quote from: Psyclax on May 12, 2010, 12:52:54 pm ---How do we calculate the solubility of a substance???
--- End quote ---
It is the number of grams that can be dissolved divided by the volume of water. You do not need to calculate it for the examination.
ksitna:
--- Quote from: vanibharutham on May 12, 2010, 04:44:08 am ---This question is about two isomeric alcohols, X and Y, each with molar mass 60g mol-1
This means that they are isomers of C3H8O
A solution of potassium dichromate(VI) in dilute sulfuric acid is added to each alcohol. Both alcohols cause the same color change of the mixture on heating.
They both were oxidized so it cant be a tertiary alcohol
a) A colorless liquid, B, is distilled from the mixture containing alcohol X.
The liquid B forms a red precipitate when it is boiled with Benedict's or Fehling's solution.
This means that it has been oxidized further so liquid B must be propanal
CH3CH2CHO
And alcohol X must be CH3CH2CH2OH
b) A colorless liquid, C, is distilled from the mixture containing alcohol Y.
C does not react when it is boiled with Benedict's or Fehling's solution
Not oxidized further so it must be Propanone - CH3C=OCH3
And the alcohol Y must be a secondary alcohol CH3CH(OH)CH3
--- End quote ---
liquid b is propan-1-ol
vanibharutham:
--- Quote from: ksitna on May 12, 2010, 02:23:07 pm ---liquid b is propan-1-ol
--- End quote ---
Nope, liquid B is obtained from Distillation of Alcohol X
X = Propan-1-ol
B = Propanal
ksitna:
markscheme says propanol :/
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version