Titration- Sodium Hydroxide and Hydrochloric acid

Question

Hi

I have a chemistry write up on titration

ok well i need help with an aim and an hypothesis(AS, AN, IF)

The xperiment which was conducted was 20mL HCl in a beaker and add 3 drops of indicator.

Drop in 0.1M of NaOH till the HCL turns light pink.

Please help and what do i talk about in the discussion and conclusion.

Will give credit to best answers.

REALLY NEEDDD HELLPP!!!!!!!!!

Answer 1

What happens is that in acid solution, the indicator is colourless, while in alkaline solution it is pink.  So as you add sodium hydroxide, you neutralise the acid until there is none left, and the next little bit of sodium hydroxide turns the indicator pink.

This is called "titration" and is the standard method for finding out the concentration of one solution if you know the other, because at the end point where the indicator changes, you have added just enough sodium hydroxide to neutralise the acid. In this case, the equation for neutralisation is just

HCl + NaOH = NaCl + H2O

so at the end point

volume of HCl x conc. HCl = volume of NaOH x conc. NaOH

or

20 mL x conc. HCl = volume NaOH added at end point  x 0.1M

So you can work out the concentration of the HCl

I suppose the aim was to find the concentration of the HCl, but I don't see where any hypothesis comes into it because you are using a well understood technique.

Hope this helps.