... water? The answer should make a specific chemical point. * The boiling temperature of ethanal is 21oC, so the cooling reduces evaporation of the ethanal. * Dissolve 50 g of sodium dichromate(VI) in 50 cm3 of water contained in a small beaker, and add 40cm3 of ethanol. Stir thoroughly, and place this mixture in the tap funnel. * Why isn't the ethanol oxidised by this mixture? * The oxidation requires hydrogen ions: the mixture as made is not acidic. Cr2O72- + 14H+ + 6e- › 2Cr3+ + 7H2O * Why is sodium dichromate(VI) used rather than the commoner potassium dichromate(VI)? * Sodium dichromate(VI) is much more soluble in ethanol than is the potassium salt. Sodium dichromate(VI) is not used in volumetric analysis since it is deliquescent, so cannot be weighed to make a primary standard solution. Potassium dichromate(VI) does not suffer from this disadvantage. * Heat the dilute acid in the ...

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