![hcl easybee hcl easybee](https://i.pinimg.com/474x/97/d2/b9/97d2b95573a55c2012353b55c2a8163d--bee-pollen-diet.jpg)
Perhaps the content of HCl is too low, and/or the change is too small to make a difference? I have tried to measure pH with a pH meter, however the change is very small. Could you give me more details, what do I need to find the concentration of Fe3+ and Fe2+? If it does then only a small amount of HCl would be consumed during etch and the difference should give fairly accurate estimate of HCl consumed. I don't know if FeCl3 dissolve steel more rapidly than HCl. This means some HCl is already consumed before the regeneration, so that the difference is not really the HCl consumed. Our mixture contains 1.7% w/w of HCl before etching, this means HCl is consumed in 2 ways:ġ: Reaction with steel during the etching To do that we first need to know how much is in the mixture.įinding difference of Fe3+ and Fe2+ should work, but I was concerned that it may only work IF HCl is added AFTER the etching process. Yes, the problem is figuring out how much HCl to add.
![hcl easybee hcl easybee](https://rukminim1.flixcart.com/image/416/416/kuzuoi80/mobile-battery/g/s/3/b-h0-flyingbee-original-imag7zx7fneakzfq.jpeg)
Lets' assume that there are no HCl present in the solution, then how could I determine the end point? Wouldn't I end up neutralizing just Fecl3? I am not sure which will be neutralize first. As you can see from the reaction above, the chloride is not involved in the reaction and thus is does not represent the HCl content. I think the ferric chloride will have significant influence, because we know the content of FeCl3 is so much higher than HCl. So basically we want to know the HCl concentration in order to ensure the regeneration takes place. We know that the initial solution is 40%w/w FeCl3 and 1.7% w/w HCl.ĭuring etching Fe3+ is consumed, the reaction isĪnd Fe2+ react with hydrochloric acid and oxygen in the air to regenerate Fe3+ģFeCl2 + 3HCl + 3/4 O2 -> 3FeCl3 + 3/2 H2O Perhaps I should have describe the problem in more detail, the mixture is used for etching steel. Hi, first of all thank you both for the reply.