[collie]

Hi Guys , I am a chemical supplier to automotive and laboratory industries. Have been supplying Ammonium Bicarbonate (food grade) to a Catalytic converter company for some time. They have been complaining that when dissolved in water(first step reaction for them), that it foams to much and some of their batches dissolves more easliy and quiker than other. Getting different results using the same batch of product. Any ideas on why this is happening? 

[Borek]

Changing water hardness? Just wild guess.

[DrCMS]

What temp do they do the first step at?

[Andy TB]

The solubility of ammonium bicarbonate is around 17% in water. What is the customer's target concentration ? If the water is acidic, then it will decompose giving off carbon dioxide (hence the foaming).

[darkswill]

What is the rate of foaming formation? if it is about 3-5 min, the pH of the water was around 6.6-6.9 and if it was faster then possible cause was accidental addition of acidic substance or chemical.