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A method for the analysis of Sr2+ suffers from an interference when Ba2+ is present. When the concentration of Sr2+ is 50 times greater

A method for the analysis of Sr2+ suffers from an interference when Ba2+ is present. When the concentration of Sr2+ is 50 times greater than that of Ba2+, the analysis of Sr2+ gives a relative error of -2.04 %. What is the value of the selectivity coefficient (Ksr.Ba) for this method? Answer to 2 decimal places, no units.

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