Titrations

L.O.:

Perform acid–base titrations, and carry out structured titrations.

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Demo

Hydrochloric acid of concentration 0.1 mol dm–3 was added from a burette into a flask containing 25.00 cm3 of aqueous sodium hydroxide until neutralisation took place. 20.00 cm3 of the acid were required. Calculate the concentration of the sodium hydroxide solution in mol dm–3.

Worksheet 2.10

What is the concentration of an NaOH solution if 25.0 cm3 is neutralized by 23.4 cm3 0.998 mol dm-3 HCl solution?

3. Calculate no. moles of NaOH:

0.0234 moles HCl = 0.0234 moles NaOH

4. Calculate conc. of NaOH: = (0.0234 × 1000) / 25.0

conc. = (moles × 1000) / volume

= 0.936 mol dm-3

1. Calculate no. moles HCl:

moles = (conc. × volume) / 1000

= 0.0234= (0.998 × 23.4) / 1000

2. Determine ratio of NaOH to HCl:

NaOH + HCl NaCl + H2O

ratio NaOH:NaCl = 1:1

Titration calculations