Xepta AutoBalance reagent

[elcapitan1993]

Ok, let's see if this straight forward just based on the error. Can you multiply your water amount by 1.1 please?

So if you were using 750ml, please use 825ml.

Let's see where that gets you.

Thank you,I will give this a shot, I will let you know how it goes.

 

[Dennis Cartier]

Also you are flushing the reagent out of the unit between switching between DIY and OEM? I just want to make sure there is no carryover.

 

[elcapitan1993]

Also you are flushing the reagent out of the unit between switching between DIY and OEM? I just want to make sure there is no carryover.

Yes I flush it every time and I purge the new reagent through for 30 seconds as well just to be safe

 

[Dennis Cartier]

So how is the new ratio looking? Were you able to get closer to OEM?

 

[elcapitan1993]

So how is the new ratio looking? Were you able to get closer to OEM?

Just performed the tests
DIY using the 825ml water and 250ml 0.1N HCL: 11.28
OEM REAGENT:11.07
Looks like it was very close this time
With a 00.21 difference based off back to back testing

 

[Dennis Cartier]

Just performed the tests
DIY using the 825ml water and 250ml 0.1N HCL: 11.28
OEM REAGENT:11.07
Looks like it was very close this time
With a 00.21 difference based off back to back testing

That is not bad. I think using 810ml water to 250ml 0.1N would be about right.

Depending on how accurate your measurements are, a bit of variability may creep in there as well.

 

[elcapitan1993]

That is not bad. I think using 810ml water to 250ml 0.1N would be about right.

Depending on how accurate your measurements are, a bit of variability may creep in there as well.

No not bad at all, I was wondering how much to tweak it, I’ll try 810ml of water, I’m using a 100ml graduated cylinder to measure it out so it is pretty close but probably not completely perfect, I do have a 100ml and a 1000ml volumetric flask but I don’t know how much it will matter vs the graduated cylinder. I wonder what acid it uses for the OEM reagent

 

[elcapitan1993]

That is not bad. I think using 810ml water to 250ml 0.1N would be about right.

Depending on how accurate your measurements are, a bit of variability may creep in there as well.

I got it within exactly at 0.1 difference of the OEM reagent , I did 810ML of reverse osmosis water and 250 of 0.1N HCL mixed for 20 minutes On a magnetic stirrer

 

[Dennis Cartier]

That is pretty good. So I guess that means a 1:3.24 is about correct.

 

[elcapitan1993]

That is pretty good. So I guess that means a 1:3.24 is about correct.

I think that’s probably as close I am going to get ,well with the equipment I have on hand at least. I’m ok with that margin of error at the moment anyway. What I don’t understand is how their reagent is mixed at 750 to 250 ml and mine doesn’t match that, could they be using sulfuric acid maybe?

 

[Dennis Cartier]

No it will not be the type of acid, but the normalization they are using. You are using 0.1N, they are using something less than that. It would have been handy if they were using an off the shelf standard like 0.1N, but they seem to not be. Oh well.

 

[elcapitan1993]

If I mixed 750 ml of water to 250 ml of 0.1N HCL what (N) would that make it?

 

[Dennis Cartier]

If I mixed 750 ml of water to 250 ml of 0.1N HCL what (N) would that make it?

That would make it a bit too strong, with too much acid. The closest of your previous tests was 1:3.24. Mixing 750 ml water and 250 ml HCL would be 1:3

It is a bit of a bummer that they did not use a standard normalization as the basis for their reagent.

If you want to improve your accuracy in mixing, you can get a volumetric flask set off of Amazon that contain various sizes of flasks. For instance, to mix 250 ml of HCL at 1:3.24, you would need a 750, 50 and 10 ml flask for the water. Filling a 10 ml flask would be a chore, so a syringe could replace that.

 

[elcapitan1993]

That would make it a bit too strong, with too much acid. The closest of your previous tests was 1:3.24. Mixing 750 ml water and 250 ml HCL would be 1:3

It is a bit of a bummer that they did not use a standard normalization as the basis for their reagent.

If you want to improve your accuracy in mixing, you can get a volumetric flask set off of Amazon that contain various sizes of flasks. For instance, to mix 250 ml of HCL at 1:3.24, you would need a 750, 50 and 10 ml flask for the water. Filling a 10 ml flask would be a chore, so a syringe could replace that.

I was just wondering what moles that would be at that ratio for a different project I’m doing ,
Thankfully I have a set of class A volumetric flasks (was not cheap)

 

[Dennis Cartier]

That would be a normalization of 0.025N if mixed at 1:3

 

[elcapitan1993]

That would be a normalization of 0.025N if mixed at 1:3

Perfect thank you!!
I have also been talking to xepta support about what molarity they are using, we will see if they are willing to tell me or not.

if I was to use 1.0 m HCL and wanted to make a liter of 0.025 HCL what ratio would I do? I only ask because I have a surplus of 1.0 m HCL I was using to make 0.1n HCL for the kh director, the reagent for the kh director is easier to make but much more expensive with the test to liter ratio
I know to make 0.1n with 1.0 it’s a 9:1 ratio

 

[Dennis Cartier]

You would have to mix at 1:30 using 1.0N HCL to get 0.025N. If the final volume is not crucial, you could mix 25ml HCL and 750ml water to get 0.025N.

 

[elysics]

Perfect thank you!!
I have also been talking to xepta support about what molarity they are using, we will see if they are willing to tell me or not.

if I was to use 1.0 m HCL and wanted to make a liter of 0.025 HCL what ratio would I do? I only ask because I have a surplus of 1.0 m HCL I was using to make 0.1n HCL for the kh director, the reagent for the kh director is easier to make but much more expensive with the test to liter ratio
I know to make 0.1n with 1.0 it’s a 9:1 ratio

How diluted it is has nothing to do with how expensive it is per test. If the sample size is the same then the only difference between 0.1n and 0.025n is that the latter uses 4 times as much reagent which might be preferable to smooth over inaccuracies with the pumps. The amount of actual acid used will be pretty much the same

 

[elcapitan1993]

You would have to mix at 1:30 using 1.0N HCL to get 0.025N. If the final volume is not crucial, you could mix 25ml HCL and 750ml water to get 0.025N.

M

How diluted it is has nothing to do with how expensive it is per test. If the sample size is the same then the only difference between 0.1n and 0.025n is that the latter uses 4 times as much reagent which might be preferable to smooth over inaccuracies with the pumps. The amount of actual acid used will be pretty much the same

i am not saying that I’m saying getting a liter of 1.0 m and 0.1 m is the same price but you technically get more liters of the diluted reagent out of it

 

[adz-94]

That is pretty good. So I guess that means a 1:3.24 is about correct.

I dicided to give the DIY reagent a go tonight by measuring by weight rather than using measuring cylinders.

I also decided to mix it on a large scale but still following the ratio given above.

5 litres of 0.1N mixed with 16.2 litres of Rodi water. Totalling 21.2 litres of reagent. Unfortunately I think the ratio given above isn't completely accurate for larger scale batches.

Xepta reagent test: 8.00dkh
Diy reagent test: 8.99dkh