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In: Chemistry

Ammonium nitrate is one of the most important nitrogenous fertilizers. Its purity can be determined by...

Ammonium nitrate is one of the most important nitrogenous fertilizers. Its purity can be determined by reacting this ammonium nitrate with Ba(OH)2. During an experiment 0.4082 g fertilizer powder was just converted by adding 24.42 ml 0.1023 M Ba(OH)2 solution. How much % ammonium nitrate is in this fertilizer?

Solutions

Expert Solution

The balanced reaction is : Ba(OH)2 + 2 NH4NO3 Ba(NO3)2 + 2 NH3 + 2 H2O

Given : concentration of Ba(OH)2 = 0.1023 M

volume of Ba(OH)2 consumed = 24.42 mL = 0.02442 L

moles of Ba(OH)2 consumed = (concentration of Ba(OH)2) * (volume of Ba(OH)2 consumed in Liter)

moles of Ba(OH)2 consumed = (0.1023 M) * (0.02442 L)

moles of Ba(OH)2 consumed = 0.00250 mol

moles NH4NO3 present = (moles of Ba(OH)2 consumed) * (2 moles NH4NO3 / 1 mole Ba(OH)2)

moles NH4NO3 present = (0.00250 mol) * (2 / 1)

moles NH4NO3 present = (0.00250 mol) * 2

moles NH4NO3 present = 0.00500 mol

mass NH4NO3 present = (moles NH4NO3 present) * (molar mass NH4NO3)

mass NH4NO3 present = (0.00500 mol) * (80.04 g/mol)

mass NH4NO3 present = 0.400 g

mass % NH4NO3 in fertilizer = (mass NH4NO3 present / mass of fertilizer) * 100

mass % NH4NO3 in fertilizer = (0.400 g / 0.4082 g) * 100

mass % NH4NO3 in fertilizer = (0.9797) * 100

mass % NH4NO3 in fertilizer = 97.97 %


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