How to calculate the strength of grignard solution?
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You can titrate the Grignard reagent following the procedure of Watson and Eastham in J. Organomet. Chem. 1967, 9, 165. A grignard forms a violet complex with 1,10-phenanthroline, and you can titrate it using an alcohol. Originally they used sec-butanol, but menthol is more convenient to use at it is a water-free solid and readily available. This method is quite accurate, since it will not give higher results due to basic hydrolysis products (e. g. magnesium alkoxides or hydroxides).
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Its easy..
just read the answer given by Hemant its absolutely right
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