Detection of Phosphorus, Metal and Oxygen in Organic Compound - Chemistry Class 11 | Summary and Q&A

TL;DR

Learn two methods for calculating the percentage of phosphorus in organic compounds: using ammonium molybdate and using magnesium.

Key Insights

• ❓ Two methods, using ammonium molybdate and magnesium, can be used to estimate the percentage of phosphorus in organic compounds.
• 🪜 The ammonium molybdate method involves a series of steps, including treating the organic compound with fuming nitric acid and adding ammonia and ammonium molybdate.
• 🪜 The magnesium method requires reacting the organic compound with fuming nitric acid and adding magnesia.
• ❓ The products obtained in both methods, ammonium phosphor molybdate and magnesium pyrophosphate, are used to calculate the percentage of phosphorus.
• 🖐️ The molar masses of the precipitates play a crucial role in the calculations.
• ❓ The percentage of phosphorus can be determined by substituting the values into the respective formulas.

Transcript

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Questions & Answers

Q: What are the two methods for determining the percentage of phosphorus in organic compounds?

The two methods are using ammonium molybdate and using magnesium.

Q: What are the steps involved in the ammonium molybdate method?

The steps include treating the organic compound with fuming nitric acid, adding ammonia and ammonium molybdate to produce ammonium phosphor molybdate precipitate.

Q: How does the magnesium method work?

In the magnesium method, the organic compound is reacted with fuming nitric acid and then magnesia is added to form magnesium ammonium phosphate precipitate, which is ignited to obtain magnesium pyrophosphate.

Q: How can the percentage of phosphorus be calculated using these methods?

For the ammonium molybdate method, the percentage can be calculated using the formula (31 * M1) / 1877, where M1 is the mass of the precipitate. In the magnesium method, the formula is (62 * M1) / 222, where M1 is the mass of the precipitate.

Summary & Key Takeaways

• There are two methods for estimating the percentage of phosphorus in organic compounds: one using ammonium molybdate and the other using magnesium.

• The ammonium molybdate method involves treating the organic compound with fuming nitric acid, followed by ammonia and ammonium molybdate, resulting in the formation of ammonium phosphor molybdate precipitate.

• The magnesium method involves reacting the organic compound with fuming nitric acid and adding magnesia, leading to the formation of magnesium ammonium phosphate precipitate, which is eventually ignited to obtain magnesium pyrophosphate.