(a.) Trityl fluoborate could have been used to make tropylium fluoborate in this

Question

(a.) Trityl fluoborate could have been used to make tropylium fluoborate in this experiment. Write a balanced equation for a reaction that could take place if you accidentally spilled some water on the trityle fluoborate. Assume a 1:1 mole ratio of the reactants.

(b.) What mass of trityl flyoborate (M.W. = 330) would be decomposed by a complete reaction with one drop of water, according to your equation in (a)? (Assume that 1 drop = 0.050 mL.) If you started with 0.40 g of trityl fluoborate, how much of it would you have left?

Explanation / Answer

(a) Let the tritylfloroborate be RBF3- then the reaction of it with H2O is,

RBF3- + 3H2O ---> RB(OH)3 + 3HF

(b) with 1 drop water = 0.05 ml/18 g/mol = 0.003 mols

Grams of trityl fluroroborate decomposed = 0.003 x 330/3 = 0.33 g

mass of trityl fluroborate left = 0.4 - 0.33 = 0.07 g

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