A2 Chemistry
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There are five audio tutorials that allow you to download and listen to teachers talking about tricky topics in your A2 course.
April 06: now with scripts as well
>>Arenes
>>Rates and mechanisms
>>Acid-base equilibria
>>NMR
>>Planning experiments
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Recently Asked Questions
- I am slightly confused; Will boiling remove the Mg2+ and Ca2+ ions from standard solutions of Mg2+ and Ca2+? Also, I was wondering what the difference is between Calcon indicator and Patton and Reeder's indicator? Does one have a sharper end-point. Or are they both just as good when trying to find the concentration of Ca2+ using an EDTA titration? 270110
- Is there a way in which ascorbic acid can be stopped from being oxidised (other than varying the temperature)? Am I correct in saying that bubbling oxygen through the acid would increase the rate of oxidation and therefore decrease the concentration of ascorbic acid? When titrating ascorbic acid and DCPIP my teacher told me to put the DCPIP in the conical flask and acid in the burette. What was the reason for this? 251109
- I'm doing an experiment to distinguish organic compounds. I know the tests that I should use to carry out, however, I am not aware of the method of these tests. The tests I have chosen are; 1. To test the presence of C=C by using Br2 in CCl4. (for ALKENE) 2. Tollen's reagent using a solution of silver nitrate in NH3 (for ALDEHYDE) 3.Brady's reagent using 2,4 DNPH (for ALDEHYDE or KETONE) 4. Iodoform test (for CH3CO- group and some related compounds) 5. Oxidation using acidified K2Cr2O7. (for primary or secondary ALCOHOL) 6. Use of reacting with Na metal to get the evolution of hydrogen. 7. The reaction with Na2CO3 to get effervesence . The objective of the lab was to identify the liquids: propanone, ethanal, propan-1-ol, propan-2-ol and ethene. I just really don't know what methods to use. 251109
updated: 26 March 2007
