Preparing Sodium Chloride

Topics: Chlorine, Sodium chloride, Titration Pages: 2 (277 words) Published: June 19, 2013
Title: Preparing Sodium Chloride
Abstract: In this practical I am going to prepare sodium chloride using sodium hydroxide + sodium chloride. Introduction:
NaOH + HCL NaCl + H2O
I am going to titrate 0.1 mol dm-3 sodium hydroxide with 0.1 mol dm-3, to find the exact proportions via titration. Aim:- To prepare sodium chloride using titration.
Apparatus:-
NaOH
HCl
Phenolphthalein
Pipette
Burette
Conical flask
Funnel

Method:
1) Pour 0.1 mol dm-3 sodium hydroxide into a burette filling it to the 0 mark. 2) Using a pipette, accurately measure 25cm3 0.1 mol dm-3 hydrochloric acid into a conical flask 3) Add 3 drops of phenolphthalein as an indicator flask.

4) Drop wise add the sodium hydroxide to the flask by slowly opening the tap on the burette. Keep swirling the flask. 5) The reaction is complete when you see the indicator turn from colourless to pink/purple. 6) Record your final volume of sodium hydroxide used and repeat the titration 3 times. 7) Work out the average of the best titration results.

8) Weigh an evaporating basin.
9) Pour 1-3 Volumetric solutions of your experiments into the evaporating dish. 10) Heat the solution gently to crystallise
11) Weigh the sodium chloride
12) Find the melting point of sodium chloride and compare to literature value.

Calculations:
Calculate % Yield using moles.

Calculate % Atom economy of the reaction.
NaOH + HCL NaCl + H2O
Molar Mass:
NaOH = 23+16+1= 40g/mol
HCl= 35.5 + 1=36.5g/mol
40+36.5 = 76.5 g/mol

NaCl= 23+35.5=58.5 g/mol
(58.5/76.5) x 100= 76.47 %

Calculate % Purity

Calculate % error.
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