I did something like that for the calculation of calcium content in a past job XD One note, pipets are calibrated for the liquid to flow out under gravity with means that this small amount that you blew out from it, should stay in the pipette for it to measure 50 mL, otherwise you add a bit over 50 mL, with is probably a source of a bit error (hardness measured by you would be higher than it is in sample). Besides that, it is a very good video!
@@RaExpIn There is also text on the pippete at which temperature it was calibrated and number of seconds you should wait until given volume is out of pippete (liquid stick to the glass due to adhesion and then fall down due to gravity, so there is usually 10 or 15 seconds interval until most of it fall down).
Thank you, very nice. I was hoping to find a simpler method as I want to determine how often to run a water regeneration cycle for a water softener but this was very informative and well presented.
Well, that looks familiar somehow... 😉 I hope this topic resonates better on your channel than mine... Why wasn't magnesium complexonate used to shorten the sluggish color change? P.S.: The lime soap should urgently be removed from the tap... 🧐
To be honest. I don't think this video will be very popular, but it had to be next after my last video. I have never heard about complexonate. Even at university we didn't use that. I guess they wanted to save money, as usual :)
@@RaExpIn Complexonates are really usefull when you don't want to bother with back titration. For example you can determine concentration of lead by adding sample in to the ammoniacal buffer and then you add magnesium complexonate and eriochrome black T as indicator. Mg is bound only weakly by EDTA, so it can be easily displaced by other metals. Pb displace Mg from its complex with EDTA and you titrate released Mg2+ ions with EDTA. It's usefull alternative for determination of lead if you don't have xylenol orange. You can also use it for determination of metal content in some insoluble salts. For example in insoluble sulfates which are very hard to get in to the solution. I tried PbSO4, it took 1 hour with constant stiring for small sample to be dissolved in ammoniacal magnesium complexonate solution. You can make your own magnesium complexonate as I did - just dissolve stoichiometric amount of MgO or Mg(OH)2 in disodium EDTA solution and let it crystallize. It crystallize as monohydrate Na2MgEDTA.H2O.
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I did something like that for the calculation of calcium content in a past job XD
One note, pipets are calibrated for the liquid to flow out under gravity with means that this small amount that you blew out from it, should stay in the pipette for it to measure 50 mL, otherwise you add a bit over 50 mL, with is probably a source of a bit error (hardness measured by you would be higher than it is in sample). Besides that, it is a very good video!
Thanks for mentioning! It's been 14 years since my last titration at university and I simply forgot... So, I pinned your comment :)
@@RaExpIn There is also text on the pippete at which temperature it was calibrated and number of seconds you should wait until given volume is out of pippete (liquid stick to the glass due to adhesion and then fall down due to gravity, so there is usually 10 or 15 seconds interval until most of it fall down).
Nie hwal się tak polaczku
Haven't heard from you in decades! Great video
Thanks! Yes, it's been a while. I just can't stop uploading, even if it takes way more time these days :)
Thank you, very nice. I was hoping to find a simpler method as I want to determine how often to run a water regeneration cycle for a water softener but this was very informative and well presented.
Happy to see your channel active again.
how do i prepare the buffer solution? i am also wondering why a ph11 solution is used instead of the more common ph 10.
Nice, straightforward explanation of water hardness titration. Here in Hungary we also use dH.
That's interesting. I only read that dH is used in countries where german is also spoken, like austria or switzerland.
great explanation
why you don't adding the volume of buffer solution when you calculate the conc. of sample
Complexometric titration ❤
Well, that looks familiar somehow... 😉
I hope this topic resonates better on your channel than mine...
Why wasn't magnesium complexonate used to shorten the sluggish color change?
P.S.: The lime soap should urgently be removed from the tap... 🧐
To be honest. I don't think this video will be very popular, but it had to be next after my last video.
I have never heard about complexonate. Even at university we didn't use that. I guess they wanted to save money, as usual :)
@@RaExpIn Complexonates are really usefull when you don't want to bother with back titration. For example you can determine concentration of lead by adding sample in to the ammoniacal buffer and then you add magnesium complexonate and eriochrome black T as indicator. Mg is bound only weakly by EDTA, so it can be easily displaced by other metals. Pb displace Mg from its complex with EDTA and you titrate released Mg2+ ions with EDTA. It's usefull alternative for determination of lead if you don't have xylenol orange.
You can also use it for determination of metal content in some insoluble salts. For example in insoluble sulfates which are very hard to get in to the solution. I tried PbSO4, it took 1 hour with constant stiring for small sample to be dissolved in ammoniacal magnesium complexonate solution.
You can make your own magnesium complexonate as I did - just dissolve stoichiometric amount of MgO or Mg(OH)2 in disodium EDTA solution and let it crystallize. It crystallize as monohydrate Na2MgEDTA.H2O.