Calculations for AS and A level Chemistry
Being confident in tackling different types of mole calculation is the foundation upon which much of A level chemistry stands
From the blog
Explaining C=O absorption bands in IR spectroscopy
Your may have noticed on the data sheet that the wavenumber for the absorption of C=O bonds very much depends
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Interpreting an infrared spectrum
An IR spectrum plots of the percentage of radiation that passes through a sample (transmittance) vs. the wavenumber of the
What is infrared spectroscopy?
Infrared spectroscopy is a really useful analytical technique for determining whether there are key bonds in a molecule (C=O, O-H,
Everything you need to know about C-13 NMR spectroscopy
13C NMR signals are considerably weaker than 1H NMR signals because the natural abundance of 13C is 1.1%. We also
Continue readingEverything you need to know about C-13 NMR spectroscopy
Everything you need to know about proton (H-1) NMR Spectroscopy
In proton or 1H NMR spectroscopy the sample is dissolved in a solvent such as tetrachloromethane, CCl4, or trichlorodeuteriomethane, CDCl3
Continue readingEverything you need to know about proton (H-1) NMR Spectroscopy
Understanding nuclear magnetic resonance spectroscopy
We are familiar with the idea that electrons possess an intrinsic quantum property known as spin (we met this when
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Deciding whether a precipitate will form
We can cause a sparingly soluble salt to precipitate out of solution if the product of the concentration of the
What is the common ion effect?
Silver chloride is a sparingly soluble salt. AgCl(s) ⇌ Ag+(aq) + Cl–(aq) Ksp = [Ag+(aq)] [Cl–(aq)] = 2.0 x 10-10
What is the solubility product?
Many ionic compounds are sparingly soluble – a good example is barium sulphate which has a solubility of 1.05 x
Understanding the relationship between Kc and Kp
We can derive a value for the equilibrium constant in a gaseous equilibrium system either using partial pressures, Kp, or
Continue readingUnderstanding the relationship between Kc and Kp