To prepare a 2 M solution of potassium nitrate (KNO3), measure the mass of the solute and the volume of the solvent.
The correct quantities that must be measured to prepare a 2 M solution of potassium nitrate (KNO3) are the mass of the solute and the volume of the solvent.
For example, to make a 2 M solution of KNO3, you would need to measure a specific amount of KNO3 (mass of the solute) and dissolve it in a certain volume of water (volume of the solvent) to achieve the desired concentration.
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