Final answer:
The crucial information when calculating the grams of potassium ions in the sample is the molar mass of potassium ions. The molar mass allows us to convert moles to grams. The volume of hydrochloric acid used and the concentration of hydrochloric acid are not crucial for this specific calculation.
Step-by-step explanation:
The crucial information when calculating the grams of potassium ions in the sample is the molar mass of potassium ions. The molar mass of a compound represents the mass of one mole of that compound, thus allowing us to convert moles to grams and vice versa.
For example, if we know the molar mass of potassium ions, we can use it to convert moles of potassium ions to grams by multiplying the number of moles by the molar mass. This calculation is essential in determining the grams of potassium ions in the sample.
The volume of hydrochloric acid used and the concentration of hydrochloric acid might be relevant in other calculations, but they are not crucial when specifically calculating the grams of potassium ions in the sample.