8 – Standardising a Sodium Hydroxide Solution (LC 2027) (Leaving Cert Chemistry): Flashcards

Process of finding exact concentration by titration against a known standard

Absorbs water vapour from air and dissolves in it

It's deliquescent, absorbs water so can't weigh exactly

$\text{HCl} + \text{NaOH} \to \text{NaCl} + \text{H}_2\text{O}$

1:1 ratio

Standard HCl solution

To help observe colour changes

Methyl orange

Yellow to red (or pink)

Solution becomes acidic

$25 \text{ cm}^3$

Within $0.1 \text{ cm}^3$

First deionised water, then with NaOH solution

Highly caustic, causes severe burns to skin/eyes

Moles of HCl = Moles of NaOH (1:1 ratio)