Lab report
EXPERIMENT 5
SEPARATION OF A MIXTURE INTO ITS COMPONENTS
BY FRACTIONAL CRYSTALLIZATION
Introduction:
Fractional crystallization is one of the experimental techniques used to separate or purify mixture.
Fractional crystallization makes use of the differences of solubility to separate the components of a mixture.
Goals:
Applying fractional crystallization to separate a mixture of salicylic acid and copper sulfate pentahydrate into its components.
Calculate the percent of salicylic acid and copper sulfate pentahy- drate in the mixture.
Procedure:
Block/McKelvy/with contributions from Georgia Perimeter Faculty (2012) - Laboratory Experiments for Chem 1211L & 1212L Cengage Learning (7th ed.) p. 23&24 (Separation of a mixture into its components by fractional crystallization)
Data and result:
Unknown number 9
Mass of unknown + beaker 69.1607 g
Mass of beaker 66.6636 g
Mass of unknown mixture 2.4971 g
Salicylic Acid Crystallization
Mass of weighing paper + Salicylic acid 1.7468 g
Mass of weighing paper 0.9446 g
Mass of Salicylic Acid 0.8022 g
Calculation of percent salicylic Acid 32.13 % in original mixture:
% salicylic acid = (m Salicylic Acid : m unknown mixture) x 100% = (0.8022 : 2.4971) x 100%
= 32.13%
CuSO4.5H2O Crystallization
Mass of weighing paper + CuSO4.5H2O 2.6484 g
Mass of weighing paper 1.0127 g
Mass of CuSO4.5H2O 1.6357 g
Calculation of percent CuSO4.5H2O 65.504% in original mixture:
% CuSO4.5H2O = (m CuSO4.5H2O : m unknown mixture) x 100% = (1.6357 : 2.4971) x 100% = 65.504%
Percent of original sample not recovered
100% - ( 32.13% +65.504%) = 2.37%
Comments concerning appearance and purity:
The salicylic acid’s appearance are pure, fine, off-white needles.
The copper sulfate pentahydrate ’s appearance first observing are contaminated, white coat outside blue crystals. Prelab question:
1. Explain briefly why CuSO4 is more soluble in water than in an organic (nonpolar)
SEPARATION OF A MIXTURE INTO ITS COMPONENTS
BY FRACTIONAL CRYSTALLIZATION
Introduction:
Fractional crystallization is one of the experimental techniques used to separate or purify mixture.
Fractional crystallization makes use of the differences of solubility to separate the components of a mixture.
Goals:
Applying fractional crystallization to separate a mixture of salicylic acid and copper sulfate pentahydrate into its components.
Calculate the percent of salicylic acid and copper sulfate pentahy- drate in the mixture.
Procedure:
Block/McKelvy/with contributions from Georgia Perimeter Faculty (2012) - Laboratory Experiments for Chem 1211L & 1212L Cengage Learning (7th ed.) p. 23&24 (Separation of a mixture into its components by fractional crystallization)
Data and result:
Unknown number 9
Mass of unknown + beaker 69.1607 g
Mass of beaker 66.6636 g
Mass of unknown mixture 2.4971 g
Salicylic Acid Crystallization
Mass of weighing paper + Salicylic acid 1.7468 g
Mass of weighing paper 0.9446 g
Mass of Salicylic Acid 0.8022 g
Calculation of percent salicylic Acid 32.13 % in original mixture:
% salicylic acid = (m Salicylic Acid : m unknown mixture) x 100% = (0.8022 : 2.4971) x 100%
= 32.13%
CuSO4.5H2O Crystallization
Mass of weighing paper + CuSO4.5H2O 2.6484 g
Mass of weighing paper 1.0127 g
Mass of CuSO4.5H2O 1.6357 g
Calculation of percent CuSO4.5H2O 65.504% in original mixture:
% CuSO4.5H2O = (m CuSO4.5H2O : m unknown mixture) x 100% = (1.6357 : 2.4971) x 100% = 65.504%
Percent of original sample not recovered
100% - ( 32.13% +65.504%) = 2.37%
Comments concerning appearance and purity:
The salicylic acid’s appearance are pure, fine, off-white needles.
The copper sulfate pentahydrate ’s appearance first observing are contaminated, white coat outside blue crystals. Prelab question:
1. Explain briefly why CuSO4 is more soluble in water than in an organic (nonpolar)