Im doing a practical in chemistry at college on the concentration of vinegar and need to know the concentration of vinegar in the UK. Can you help please?
• Why are silica gel plates with a backing of aluminium used instead of the normal chromatography paper for vinegar investigations? • I am currently doing an investigation on the purity of aspirin. I have found that the melting point of aspirin is about 135 C. However, when I crushed a SOLUBLE aspirin tablet to test the melting point the sample did not melt even at 200 C. Can you tell me whether soluble aspirin has a different melting point and why it does not melt at 135 C? • What would the ideal concentration of NaOH be if I were to hydrolyse aspirin before using back titration to find its purity? • I am going to do an investigation on preparation of aspirin. What method can I use to determine which synthesis is most efficient? Do I (also) have to include the method of recrystallization and thin layer chromatography? • I have been carrying out the investigation of the reactions between acids and metals. I have been trying to calculate the half-life of the reaction between sulphuric a
