3. A stud ent performed a similar experiment, reacting ammonia with sodium hypoc

Question

3. A stud ent performed a similar experiment, reacting ammonia with sodium hypochlorite to form nitro rm nitrogen gas, using 0.5 M solutions of ammonia and sodium h anced chemical equation and the data from the experiment are given below. Find the point intersection of the two best-fit equations. The x-value will that to identify the stoichiometric ratio between the two reactants. The y-value will be the amount of nitrogen gas that would be produced at that point.(6 points) lorite. The unbal be the mL of ammonia used. Use N, Production with Varying Amounts of NH, 0.12 0.1 t y 0.0054x + 0.001 0.96429 y -0.0038x +0.1877 0.97894 0.08 0.06 E 0.04 0.02 0 5 10 15 20 25 30 35 40 45 50 Amount of NH, Added (mL) Ratio of NaOCl d .1IL Volume of N2 gas produced

Explanation / Answer

Reaction
3NaOCl(aq) + 2 NH3(aq) ---> N2(g)+ 3 NaCl(aq) + 3H2O(l)

3 mole NaOCl and 2 moles of NH3 take part in the above redox reaction

Molar mass : NaOCl, 74.44 g / mol , NH3 , 17 g / mol

Sodium hypochlorite is a strong oxidising agent. it oxidises NH3 to N2

20 ml of 0.5 M NH3 equals to 20 * 0.5 *[ 17/1000] = 0.17 g NH3 and this is 0.17/17 = 0.01 moles of NH3

[ 1 molar NH3 soln = 17 g NH3 / 1000 ml soln ] , 1 ml 0.5 M NH3 soln = 0.5 * 17 g KI / 1000 ml soln ]

From the reaction, 2 moles NH3 reacts with 3 mole NaOCl,

therefore 0.01 moles NH3 would react with 0.0066 moles NaOCl

Mole ratio of NH3 / NaOCl = 2 moles NH3 / 3mole NaOCl = 1.5

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