- 5 A 0 400 Mg Initial Sample Of Radioactive Iodine 123 Used To Treat Thyroid Cancer Decreases To 0 113 Mg After 24 0 H 1 (34.17 KiB) Viewed 33 times
5. A 0.400 mg initial sample of radioactive iodine-123, used to treat thyroid cancer, decreases to 0.113 mg after 24.0 h
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5. A 0.400 mg initial sample of radioactive iodine-123, used to treat thyroid cancer, decreases to 0.113 mg after 24.0 h
5. A 0.400 mg initial sample of radioactive iodine-123, used to treat thyroid cancer, decreases to 0.113 mg after 24.0 hrs. Determine the half-life of iodine-123. 6. What is the molarity of a solution made by dissolving 3.4 g of Ba(OH)2 in enough water to make 450 mL of solution? Assume that Ba(OH)2 dissociates completely in water to Ba* and OH’ions. What is the pH of the solution? 7. A 0.015 M solution of hydrogen cyanate, HOCN, has a pH of 2.67 (a) What is the hydronium ion concentration in the solution? (b) What is the ionisation constant, K., for the acid? (c) What is the % ionisation for this solution? 8. The weak base, ClO (hyperchlorite), is used in the form of NaClO as a disinfectant in water treatment plants. What are the concentrations of HCIO and OH' and the pH of a 0.015 M solution of Nacio?
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