In a Kjeldahl's estimation, 0.7 g of an organic compound containing 20 % nitrogen by mass was analyzed. The ammonia gas evolved was completely neutralized by a 0.5 M H ₂ SO ₄ solution. The volume of the acid required for neutralization is ________ mL .

Step-by-step solution

Mass of nitrogen in the compound = 0.7 20 100 = 0.14 g Moles of nitrogen = 0.14 14 = 0.01 mol = 10 mmol Since 1 mole of nitrogen produces 1 mole of NH ₃ , the millimoles of NH ₃ evolved = 10 mmol . Milliequivalents of NH ₃ = 10 meq . For neutralization, Milliequivalents of H ₂ SO ₄ = Milliequivalents of NH ₃ Molarity n -factor V( in mL ) = 10 0.5 2 V = 10 V = 10 mL Answer: 10