I cooked chick peas as per the pack instructions, boiling themin water with a sp

Question

I cooked chick peas as per the pack instructions, boiling themin water with a spoonful of bicarbonate of soda. After an hour ofboiling, the water was black and the pot gave off a smell ofrotten eggs. What could this substance have been? And what must have beencontaminating the water in the first place to produce this byreacting with bicarbonate of soda? I cooked chick peas as per the pack instructions, boiling themin water with a spoonful of bicarbonate of soda. After an hour ofboiling, the water was black and the pot gave off a smell ofrotten eggs. What could this substance have been? And what must have beencontaminating the water in the first place to produce this byreacting with bicarbonate of soda?

Explanation / Answer

The bicarbonate of soda is a catalyst for these reactions.   The rotten eggs smell is the formation of H2S hydrogen sulfide which is colorless gas.  this is from the breakdown of the sulfur protiens in the chick peas.  This in turn reacts with silver ion in solution to give Silver Sulfide Ag2S.  A black substance. Sot he silver ions were contaminating the water in the first place to react with the  hydrogen sulfide that was produced by the breaking down of the chick peas sulfur protiens.

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