Titration of water hardness (complexometry explained). Bonus: Calcium in milk

[@areebsiddiqui9999]

Masha Allah !!!! Very Useful For University Level Students ❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤ Keep Up The Great Nice Work From Pakistan 🇵🇰🇵🇸❤❤❤❤❤❤❤❤

[@sahiyatinassim3014]

I love you all video it make me joy every time 😁😁

[@lenkaweglarz]

Thank you! Your video really helped me to get to understand this process. Very useful!

[@chatzida]

I am glad that it was helpful!

[@mariansyk]

You have saved me. Χαιρετίσματα από international σχολείο της Ισπανίας :). Ωραίο βίντεο μπράβο

[@chatzida]

Χαίρομαι που βοήθησε! IB project? Όταν λέτε international σχολειο εννοείτε "Ευρωπαϊκό σχολείο" ή κάτι άλλο;

[@mariansyk]

@@chatzida ib ναι. Κάνουμε internal assesments στην 3η λυκείου με τα παιδιά. ( ατομικά projects ) Είναι ιδιωτικό internacional. Πρέπει να είναι πολύ τυχερά τα παιδιά που κάνετε τέτοια πειράματα σε δημόσιο σχολείο. Νομίζω δεν είναι σύνηθες. Μπράβο και για το εξαιρετικής ποιότητας βίντεο. Συγχαρητήρια

[@anujsharma7853]

It's a gem for me. Love from India

[@franciscojaviergamez9548]

I like this video also. But I have some questions about the procedure. Does anyone know how I could contact with them?.

[@samratkumawat9757]

Thanks so much

[@tubbakhan4376]

Amazing video very informative

[@nguyenthuy9824]

Thanks Video. However I've once question is that - how have you checked aluminium ion or ferrous ion or zinc ion in water before titrating hardness water yet? Because not only calcium ion, magieum ion will be complex but also these ions (Al3+, Zn2+, Fe2+....) will be complex so. And how did you coat these ions in solution?

[@COC_champs1]

I want to be one of them (4 students) , i can do it♥️

[@chemistryfun]

Me also

[@iqrakabirnoor]

Nice

[@chimekkoo-old]

Me tooo

[@angelasun9896]

Hello, does anyone know what pH of buffer is this using? Is it the neutral buffer solution 7? @chatzida

[@eleazer_kips]

Ph 10

[@chatzida]

No. It is a pH=10 buffer made with ammonia/ ammonium chloride

[@shraddhanair5254]

can you explain the principle behind calcium content being found ?

[@echoofthepast07]

Hi, I'm preparing to do this titration and I was just wondering what the concentration/method of preparation of the ammonia buffer solution was. I'd really appreciate it if you could send me the source material if there was any. Thank you so much!

[@chatzida]

This is how you will prepare the buffer solution. For 200 mL buffer pH=10, 1M in ammonia: Add 13.5 mL of 25 % ammonia solution to 50 mL deionized water. In this dissolve 1.94 g of solid NH4Cl. Add water to 200 mL final volume and mix. Sorry for the delay.

[@echoofthepast07]

@@chatzida no problem! thank you so much!

[@Best.Chem.612]

​@@chatzida Can you share the calculation for buffer pH= 10. I mean why we take 13.5 mL of 25% ammonia solution and 1.94 g of ammonium chloride.

[@lillian9448]

hii, great video! if I want to do this using yoghurt, what is the suitable amount? is it possible to determine the concentration of calcium and magnesium individually? lastly, I don't quite understand how the calculation works in 8:58 second line.

[@lillian9448]

and also, if we calculate the calcium concentration in milk, will the magnesium has the exact same concentration as the calcium?

[@chatzida]

@@lillian9448 this method calculates the SUM of magnesium and calcium; calcium in milk is usually 10-15 times (in terms of milligrams) more than Mg.

[@chatzida]

For the 1st question , I don't know but personally I would dilute yoghurt with 3-4 volumes of water , stir well, filter through a mesh, perform titration and then adjust your calculations considering the dilution. For the 2nd question, I am not aware of any titration method for individual determination, but there should be other more advanced methods like atomic absorption spectroscopy. For the 8:58 calculations we assume that all moles are Ca2+ (accordingly, we assumed that there is only CaCO3 - and not MgCO3 - in water) and therefore we multiply by atomic mass of calcium (=40)

[@totocatz7342]

@@chatzida hello! i'm not sure if i did this dilution right but i was curious in figuring out how i could dilute the yoghurt, (unit wise how many ml of water would that be?), i also found that before my titration the sample with the Black T indicator turned blue, and after titrating with EDTA it turned purple.. (which for this experiment I believe is supposed to be the opposite), do you might have an idea why and what i could be doing wrong?

[@chatzida]

For the first question you can weigh like 20 g of yoghurt add about 50 mL water , stir well, filter through mesh and then add water to the flow-through up to 100 mL final volume. For the 2nd question, it seems that pH was not 10 (did you use a pH=10 buffer?)

[@fancyboi2616]

Why does the EDTA solution have to be diluted to 0.01? Also, why is ethanol used in the indicator solution?

[@arvindmishraful]

Hey loved this from india

[@nurhafirani8631]

Great video. I want to ask a question. I used 0.1g patton-Reeder indicator to determine calcium in my sample. But it turn directly to purple after i added the indicator. It should be pink to purple to blue(end point). Is 0.1g is too much or my calcium content in sample is to low?

[@lokeyBaby]

i think that happened cause you used a different type of indicator.

[@goldggongchi]

so useful❤❤👍

[@aloyseg]

Hello, I am writing an essay on different amounts of calcium present in various types of milk and I would like to reference your name in the methodology as I have use the same method to conduct my experiment as the one in the video. Could you please give me the name you would like to be referenced by?

[@chatzida]

Sorry for the delayed response. My name is Dr. Chatzidakis Ioannis. I am really glad you found our method useful!

[@egekaradag8307]

is there any chance that i can have the procedure

[@md.abdullah7240]

Very helpful vedio ❤️👍

[@shabnammostary8940]

Why pH is 10 during the experiment

[@chatzida]

At pH>10 there is a)sedimentation of Mg(OH)2 and b) the color of indicator at final point is orange which can not easily be discriminated from red. At pH

[@shabnammostary8940]

@@chatzida Thank you

[@zoohorshaglof1285]

thanks

[@Clear1380]

Why is there no translation into Arabic?😕

[@GisliNairs]

I need 4 samples of water where can i get? I have no water bodies near me...

[@md.shahinsarkar1625]

calculation procedure

[@mahendrapratapsing7679]

India

[@sanjeevtripathi5513]

Preparation videos

[@mrunalbts]

Who is here on the link from aparna sajjan maam

[@yashbhargav4867]

Hii