Question

what mass in milligrams of potassium nitrate is present in0.25kg of a 500ppm kno3(aq)​

Answer 1

What mass in milligrams of potassium nitrate is present in 0.25kg of a 500ppm KNO3(aq)?

1. ppm = mass solute (mg) ÷ mass solution (kg)

2. Re-arrange this equation to find the mass of solute:

mass solute (mg) = ppm x mass solution (kg)

3. Substitute in the values:

mass KNO3 = 500ppm x 0.25kg = 125mg