Question

For the borax solution at 48 degree C, no solid borax is present in the test tube. Five milliliters is transferred to the corresponding calibrated test tube and subsequently titrated with the standardized hydrochloric acid solution. How will this oversight in technique affect the reported k_sp of borax at 48 degree C-too high, too low, or unaffected? Explain.

Answer 1

It is given that there is no solid borax present in the test tube. That means only the borax present in borax solution is there As the solid borax has dissociated more, lower amount of standardized hydrochloric acid solution is required for the titration The concentration of standard HCl solution required is less results in lowering the molar solubility. Hence, value of Ksp will be lowered to a great extent and it will be too low.