Final answer:
The amount of magnesium sulfate to be given intravenously is determined by a healthcare professional and cannot be deduced from the options given. It is common to administer a 0.5% KCl solution for hypokalemia and normal saline for dehydration. The solubility of magnesium compounds like Mg(OH)2 can be calculated using the Ksp in pharmaceutical preparations.
Step-by-step explanation:
Determining IV Dosage for Magnesium Sulfate
The amount of magnesium sulfate to be given intravenously cannot be determined solely from the options provided as it depends on various patient-specific factors such as the individual's weight, medical condition, and the reason for administration. However, in general medical practice, dosage ranges for magnesium sulfate intravenous (IV) therapy are usually given in grams and are determined by a healthcare professional. When reference is made to the preparation of IV solutions, it is indeed the case that, for example, an IV of 0.5% KCl will be taken from the supply cabinet if a physician orders it for a patient with hypokalemia.
For dehydrated patients, a common IV fluid is normal saline, a 0.16 M solution of sodium chloride. As for the exercise about magnesium sulfate's hydrated form, when heated, the water of hydration is removed and the change in mass can be used to calculate the number of water molecules originally present.
In the case of magnesium hydroxide, Mg(OH)2, its solubility and the solubility product constant (Ksp) are important when considering how much would dissolve in water. The ionic reaction, Mg(OH)2 → Mg2+ (aq) + 2OH- (aq), and the corresponding Ksp expression must be taken into account to determine the actual amount soluble.