Edexcel A Level Chemistry:复习笔记8.1.1 Finding Ka Values
Core Practical 9: Finding Ka for a Weak Acid The?Ka?of a weak acid may be determined by finding the pH at the half equivalence point At the half equivalence point?Ka?= [H+] Key steps in the ...
Edexcel A Level Chemistry:复习笔记7.7.5 Other Chromatography
Types of Column Chromatography Column Chromatography In column chromatography, the column is often a long vertical glass tube or in the laboratory a burette is suitable An inert solid (usual...
Edexcel A Level Chemistry:复习笔记7.7.4 Thin-Layer Chromatography
Thin Layer Chromatography Principles of Chromatography Chromatography is a technique that enables the separation of mixtures and includes: thin-layer chromatography (TLC) column chromatograp...
Edexcel A Level Chemistry:复习笔记7.7.3 Proton NMR
Proton NMR - Introduction Nuclear Magnetic Resonance (NMR)?spectroscopy is used for analysing organic compounds All samples are measured against a reference compound –?Tetramethylsilane (TMS) ?Tetr...
Edexcel A Level Chemistry:复习笔记7.7.2 Carbon-13 NMR
Using Carbon-13 Data Nuclear Magnetic Resonance (NMR) spectroscopy is used for analysing organic compounds Atoms with odd mass numbers usually show signals on NMR For example, isotopes of at...
Edexcel A Level Chemistry:复习笔记7.7.1 Mass Spectrometry
Using Mass Spectra At AS level, you have used mass spectrometry to determine: Relative atomic mass from isotopic abundance Possible molecular formulae from molecular ion peaks Organic struct...
Edexcel A Level Chemistry:复习笔记7.6.6 Organic Techniques - Purity
Melting & Boiling Point Determination Melting point determination The melting point of a solid is indicative of its purity and identity A melting point can be matched to a known substanc...
Edexcel A Level Chemistry:复习笔记7.6.5 Organic Techniques - Purification
Purification Methods There are different methods to purify organic compounds, including: Solvent extraction / use of a separating funnel Use of drying agents Recrystallisation Solvent extrac...
Edexcel A Level Chemistry:复习笔记7.6.4 Organic Techniques - Preparation
Distillation & Refluxing Simple distillation Simple distillation is a common practical completed in organic chemistry It is used as there are times that a reaction does not go to complet...
