Question

к красному фосфору прилили бром.К полученному вещесву по каплям добавляли воду,а выделяющийся газ пропускали через раствор нитрата серебра.Запишите уравнения описанных реакций.

Answer 1

2P+3Br2=2PBr3

PBr3 + 3H2O = H3PO3 + 3HBr 

HBr+AgNO3=AgBr+HNO3 

Answer 2

Reaction Equations

When bromine is added to red phosphorus, the following reaction occurs:

Red Phosphorus + Bromine → Phosphorus Tribromide

The reaction equation for this process is:

P4 + 6Br2 → 4PBr3

When the resulting substance is added dropwise to water, and the evolved gas is passed through a solution of silver nitrate, the following reactions take place:

Phosphorus Tribromide + Water → Phosphorous Acid + Hydrobromic Acid

The reaction equation for this process is:

PBr3 + 3H2O → H3PO3 + 3HBr

Hydrobromic Acid + Silver Nitrate → Silver Bromide + Nitric Acid

The reaction equation for this process is:

2HBr + AgNO3 → 2AgBr + HNO3

These are the reactions that occur when bromine is added to red phosphorus and the resulting substance is treated with water and passed through a solution of silver nitrate.

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