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Final answer:

To prepare a 25% potassium sulfate solution in 630g of water, calculate the grams of solute required using a specific formula.


Explanation:

To calculate the grams of solute needed to prepare a 25% potassium sulfate solution in 630g of water, use the formula:

grams of solute = (percentage of solute x grams of solvent) / (100% - percentage of solute)

Substitute the values to find the grams of potassium sulfate needed.


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