Suppose that for the preparation of the stock solution of borax, the solid borax

Question

Suppose that for the preparation of the stock solution of borax, the solid borax reagent is contaminated with a water-soluble substance that does not react with hydrochloric acid. How will this contamination affect the calculated solubility product of borax according to the Experimental Procedure? Explain. In the analysis of the B_4O_5(OH)_4^2- concentration in one of the 5-mL borax samples, suppose that the bromocresol green endpoint was surpassed. How does this affect the reported solubility product of borax at that temperature? Explain.

Explanation / Answer

1. Presence of water soluble impurity in borax solution which does not react with HCl would lower the solubility found by experiment. The solution would be less concentrated with borax as the solution also has soluble impurity in it. Lower amount of HCl would be used for the experiment and thus lower solubility would be obtained.

2. In the analysis of B4O5(OH)4^2-, If the indicator bromcreasol green endpoint is surpassed, more HCl had been added to the solution. This would give higher values for the borax present in solution and thus higher solubility would be obtained by this result which would be incorrect.

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