a-laboratory-student-prepared-a-0-00155-m-kbr-solution-with-a-small-amount-of-ra

Question

A laboratory student prepared a 0.00155 M KBr solution with a small amount of radioactive 77Br (t_1/2 = 57.04 h). She recorded the activity of the solution as 0.127 mCi/mL. She used 25.0 mL of this solution to precipitate an unknown metal Y as YBr. She mixed the KBr solution with 25.0 mL of 0.00234 M YNO₃ solution. She removed the precipitate by filtration and the activity of the obtained filtrate after 5 hours was 0.0156 mCi/mL. Calculate the molar concentration of Y⁺, Br⁻, and the solubility product of YBr.

Accepted Answer

[Y⁺] = 5.97×10⁻⁴ M
[Br⁻] = 2.02×10⁻⁴ M
K_sp = 1.21×10⁻⁷

Answer

[Y⁺] = 1.17×10⁻³ M
[Br⁻] = 2.35×10⁻³ M
K_sp = 7.22×10⁻⁶

Answer

[Y⁺] = 2.45×10⁻⁴ M
[Br⁻] = 5.14×10⁻⁴ M
K_sp = 1.21×10⁻⁷

Answer

[Y⁺] = 7.01×10⁻³ M
[Br⁻] = 1.12×10⁻⁴ M
K_sp = 9.11×10⁻⁷

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