CHEMISTRY IA- UNIT 1 EXPERIMENT 2- USING TITRATION METHOD DETERMINE THE % BY MASS OF Na 2 CO 3 IN AN IMPURE SOLUTION Titration is used to find the volume of an unknown solution that is required to neutralize a solution of known concentration. The titre value can be used to calculate the concentration of the unknown solution. In this experiment B1 is a solution containing a mixture of sodium carbonate and sodium chloride. The concentration of sodium carbonate in the mixture is found by titrating the impure mixture with standardized hydrochloric acid using methyl orange indicator. The percentage by mass of sodium carbonate in the mixture can then be calculated. The equation for the neutralization reaction is given below: Na 2 CO 3 (aq) + 2HCl aq) → 2 NaCl (aq) + CO 2 (g) + H 2 O (l) The colour change in the indicator from yellow to orange red signals the end point of the reaction. Apparatus and materials 1. A1- 0.1 moldm -3- HCl 2. B1- solution containing 50 gdm -3 of Na 2 CO 3 /NaCl mixture 3. Methyl orange indicator 4. 250 cm 3 graduated flask 5. 25 cm 3 pipette 6. Two 50 cm 3 burette 7. Three 250cm 3 conical flasks 8. Funnel Procedure 1. Using a burette, place 30cm 3 of B1 in 250 cm 3 graduated flask. Make up the contents of the flask to the mark with distilled water and label this solution B2. 2. Place A1 in a second burette 3. Pipette 25.0 cm 3 of B2 into a conical flask and titrate wit A1 using methyl orange indicator until the solution changes from yellow to orange/red
CHEMISTRY IA- UNIT 1EXPERIMENT 2- USING TITRATION METHOD
DETERMINE THE % BY MASS OF Na2CO3 IN AN IMPURE SOLUTION
Titration is used to find the volume of an unknown solution that
is required to neutralize a solution of known concentration. The
titre value can be used to calculate the concentration of the
unknown solution.In this experiment B1 is a solution containing a
mixture of sodium carbonate and sodium chloride. The concentration
of sodium carbonate in the mixture is found by titrating the impure
mixture with standardized hydrochloric acid using methyl orange
indicator. The percentage by mass of sodium carbonate in the
mixture can then be calculated. The equation for the neutralization
reaction is given below:Na2CO3 (aq) + 2HCl aq) 2 NaCl (aq) + CO2
(g) + H2O(l)The colour change in the indicator from yellow to
orange red signals the end point of the reaction. Apparatus and
materials 1. A1- 0.1 moldm-3 HCl2. B1- solution containing 50 gdm-3
of Na2CO3/NaCl mixture3. Methyl orange indicator4. 250 cm3
graduated flask5. 25 cm3 pipette6. Two 50 cm3 burette7. Three
250cm3 conical flasks 8. FunnelProcedure1. Using a burette, place
30cm3 of B1 in 250 cm3 graduated flask. Make up the contents of the
flask to the mark with distilled water and label this solution
B2.2. Place A1 in a second burette3. Pipette 25.0 cm3 of B2 into a
conical flask and titrate wit A1 using methyl orange indicator
until the solution changes from yellow to orange/red4. Repeat
titration as many times as necessary to obtain accurate
results.Table 1: volume of B1Final burette reading/cm3
Initial burette reading/cm3
Volume of B1/cm3
Table 2: titration of B2 with A1Rough Accurate
123
Final burette reading/ cm3
Initial burette reading/ cm3
Volume of A1 used/ cm3
25.0 cm3 of B2 required .cm3 of A1 for neutralization.Data
analysis1. Find the number of moles of HCl in the titre value2.
Find the number of moles of Na2CO3 in 25 cm3 of B23. Find the
number of moles of Na2CO3 in the 250 cm3 of B24. Calculate the
concentration in moldm-3 of B15. Calculate the concentration in
gdm-3 of B16. Calculate the percentage by mass of Na2CO3 in B1
