Question

осуществить цепочку превращений 1)P-P2O5-H3PO4-Na3PO4 2)P-PH3-P2O5-NaH2PO4 3) H3PO4-NaH2PO4 4)Na2HPO4-Na3PO4

Answer 1

1)P-P2O5-H3PO4-Na3PO4

 

4P+5O2=2P2O5

P2O5+3H2O=2H3PO4

3NaOH+H3PO4=Na3PO4+3H2O

 

2)P-PH3-P2O5-NaH2PO4 

P4+6H2=4PH3

2PH3+4O2=P2O5+3H2O

P2O5+2NaOH+H2O=2NaH2PO4

 

 

 

 

 

3)H3PO4-NaH2PO4

H3PO4 NaOH=NaH2PO4+H2O

 

 

4)Na2HPO4-Na3PO4

Na2HPO4+NaOH=Na3PO4+H2O

 

 

 

 

 

 

Answer 2

Chain of Transformations:

To provide a detailed explanation of the chain of transformations, let's break it down step by step:

1) P - P2O5 - H3PO4 - Na3PO4: - The first transformation involves the element phosphorus (P) and its compounds. It starts with elemental phosphorus (P), which reacts with oxygen (O) to form phosphorus pentoxide (P2O5). - Phosphorus pentoxide (P2O5) can then react with water (H2O) to form phosphoric acid (H3PO4). - Finally, phosphoric acid (H3PO4) can react with sodium hydroxide (NaOH) to produce sodium phosphate (Na3PO4).

2) P - PH3 - P2O5 - NaH2PO4: - The second transformation also involves the element phosphorus (P) and its compounds. It starts with elemental phosphorus (P), which can react with hydrogen (H2) to form phosphine (PH3). - Phosphine (PH3) can then react with oxygen (O) to form phosphorus pentoxide (P2O5). - Phosphorus pentoxide (P2O5) can react with water (H2O) to form phosphoric acid (H3PO4). - Finally, phosphoric acid (H3PO4) can react with sodium hydroxide (NaOH) to produce sodium dihydrogen phosphate (NaH2PO4).

3) H3PO4 - NaH2PO4: - The third transformation involves only phosphoric acid (H3PO4) and sodium hydroxide (NaOH). Phosphoric acid (H3PO4) can react with sodium hydroxide (NaOH) to produce sodium dihydrogen phosphate (NaH2PO4).

4) Na2HPO4 - Na3PO4: - The fourth and final transformation involves sodium dihydrogen phosphate (NaH2PO4) and sodium hydroxide (NaOH). Sodium dihydrogen phosphate (NaH2PO4) can react with sodium hydroxide (NaOH) to produce sodium phosphate (Na2HPO4). - Sodium phosphate (Na2HPO4) can further react with sodium hydroxide (NaOH) to form trisodium phosphate (Na3PO4).

Summary:

To summarize the chain of transformations: 1) P - P2O5 - H3PO4 - Na3PO4 2) P - PH3 - P2O5 - NaH2PO4 3) H3PO4 - NaH2PO4 4) Na2HPO4 - Na3PO4

Please note that the information provided is based on the available search results and may not cover all possible reactions or conditions.