The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 14.3 days. If you begin with 40.4 mg of this isotope, what mass remains after 22.3 days have passed?_____mg 42.0 mL sample of a 0.476 M aqueous hydrofluoric acid solution is titrated with a 0.305 M aqueous barium hydroxide solution. What is the pH after 19.9 mL of base have been added? Ka for HF is 7.2 × 10^-4 pH =____

Chemistry & Chemical Reactivity
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Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
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Chapter25: Nuclear Chemistry
Section25.8: Applications Of Nuclear Chemistry
Problem 25.9CYU
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The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 14.3 days. If you begin with 40.4 mg of this isotope, what mass remains after 22.3 days have passed?_____mg 42.0 mL sample of a 0.476 M aqueous hydrofluoric acid solution is titrated with a 0.305 M aqueous barium hydroxide solution. What is the pH after 19.9 mL of base have been added? Ka for HF is 7.2 × 10^-4 pH =____
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