Titration (using phenolphthalein)

*** For those who have not noticed the previous comments about the accuracy in the video:
This video was made as a quick guide for one of my classes about what a titration is and it wasn’t meant to be an exact representation since that would have taken longer and I wanted to get to the end point faster so they could see what happens. I explained to them that it would need to be done more accurately if they were ever to do one themselves. ***
A titration experiment is used to calculate an unknown concentration of acid (or alkali) using a neutralisation reaction.

In this titration an alkali (with a known concentration) is carefully added to the acid (of unknown concentration) using a burette. The volume of alkali used in the experiment is needed in order to perform a calculation to work out the concentration of the acid.

The acid used in this titration is hydrochloric acid (HCl, 25ml volume, unknown concentration) and the alkali used is sodium hydroxide (NaOH, 0.1M concentration).

Useful equations to calculate the unknown concentration of acid:

number of moles = concentration x volume

concentration = number of moles ÷ volume

Concentration is measured in moles per litre (moldm-3)
Volume is measured in litres (decimetre cubed: dm3)

The equation for this reaction is:
hydrochloric acid + sodium hydroxide —- sodium chloride + water

HCl + NaOH —- NaCl + H2O
(using subscript for the 2 in H2O)



23 responses to “Titration (using phenolphthalein)”

  1. Latha tha Avatar

    Totally wrong procedure you r suppose to take 10ml of oxalic acid in pippete not hcl and end point should be permanent pale pink colour not dark pink

  2. light side of life Avatar

    It should be light pink in colour or we won't be able to get concurrent reading

  3. Aditya Rajpurohit Avatar

    thank a lot of you bro …………..it will be useful for me………

  4. Hunain Ashraf Avatar

    excellent very best

  5. amir ali Avatar

    thank u so much for conceiving such a wise concept of titration.

  6. Scorpancerxx Avatar

    He was getting frustrated lol
    no offence great video
    helped me for my ATP

  7. WackyWestie Avatar

    so when they finished the experiment, was the resulting solution alkali not acidic as it was pink? I thought that it was supposed to be neutral but the indicator says its alkali… I'm even more confused than when I started

  8. Mastura Sleman Avatar

    Thanks for Helping me tomorrow is my test

  9. Tauheed H322 Avatar

    Don't u think that the colour is too deep pink …very very very light pink depicts that titration is done. Dark pink is not accepted .

  10. FiRaS GaMeR Avatar

    the experiment helped me to understand,but the music was so fucking terrible

  11. Purujeet Malik Avatar

    thanks sir it had helped me at last moment

  12. Enjoy ur study Avatar

    some salt analysis test is there sir.

  13. Shiv Shankar Chaudhary Avatar

    This experiment clarify more clearly that a lecture.

  14. parashu ram Avatar

    How can priper in to make naptelin and colour

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