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!

[@samratkumawat9757]

Thanks so much

[@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?.

[@COC_champs1]

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

[@chemistryfun]

Me also

[@iqrakabirnoor]

Nice

[@chimekkoo-old]

Me tooo

[@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

[@tubbakhan4376]

Amazing video very informative

[@zoohorshaglof1285]

thanks

[@fancyboi2616]

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

[@shraddhanair5254]

can you explain the principle behind calcium content being found ?

[@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

[@arvindmishraful]

Hey loved this from india

[@goldggongchi]

so useful❤❤👍

[@egekaradag8307]

is there any chance that i can have the procedure

[@user-cc4ob4sw3q]

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!

[@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.

[@md.abdullah7240]

Very helpful vedio ❤️👍

[@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?)

[@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

[@mahendrapratapsing7679]

India

[@md.shahinsarkar1625]

calculation procedure

[@sanjeevtripathi5513]

Preparation videos

[@GisliNairs]

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

[@yashbhargav4867]

Hii

[@mrunalbts]

Who is here on the link from aparna sajjan maam

[@Fatom_Tota]

Why is there no translation into Arabic?😕