9. Select the solution with this highest pH. (a) 1.0 Molar NaOH (aq.) (c) 1.0 Mo

Question

9. Select the solution with this highest pH. (a) 1.0 Molar NaOH (aq.) (c) 1.0 Molar NaHCO3 (aq.) (b) 1.0 Molar NaCI (aq.) (d) 1.0 Molar HC1(aq.) 10. Given the solubility of compound A in the solvents listed below, which two solvents would you choose to perform a mixed-solvent recrystallization of compound A? (a) water/ethyl acetate (b) water/petroleum ether (c) ethyl acetate/petroleum ether (d) no mixture of these solvents will work solvent Solubility cold hot water ethyl acetate petroleum ether not soluble soluble not soluble not soluble soluble not soluble

Explanation / Answer

9. The solution with highest pH will be most basic as it will have lowest hydrogen ion concentration. This is true for the option (a) 1.0 M NaOH (aq)

10. The correct answer is (d) none of these solvent systems will work.

For crystallization the nest solvent or best solvent system is one in which compound A is insoluble in cold and soluble in hot. Such a solvent system cannot be obtained from any of the given solvents.

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