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Determination of the relative molecular mass of sodium carbonate by titration.

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Introduction

Title : Determination of the relative molecular mass of sodium carbonate Data collection: (A) Qualitative o Colour of methyl orange changes from reddish pink to orange (B) Quantitative o Tare weight of sodium carbonate: 2.5061g � 0.0001g o Volume of sodium carbonate in volumetric flask: 250.00cm� �0.15cm� o Volume of sodium carbonate in pipette: 25.00cm� � 0.25cm� o Volume of 0.09677M hydrochloric acid used: Burette reading (cm�) Titration 1 Titration 2 Titration 3 Initial reading � 0.05cm� 0.00 0.00 0.00 Final reading � 0.05cm� 27.50 27.30 27.70 Volume of HCL used � 0.10cm� 27.50 27.30 27.70 Average reading for volume of 0.09677M hydrochloric acid used 27.50 + 27.30 + 27.70 = 27.50cm� � 0.10cm� 3 Data processing: Subject Calculation % uncertainties Tare weight of sodium carbonate 0.0001 g x 100% 2.5061 g ...read more.

Middle

x 0.09677 M 1000 = 0.002661mole � 0.3636% Based on the equation, one mole of H2NSO3H reacted with one mole of HCL. Therefore, 0.00261mole of HCL reacted completely with 0.00261mole of H2NSO3H. However, 0.00261 � 0.3636% mole of HCL reacted with only 25.00cm� � 1.00% of sodium carbonate. Therefore, the exact mole for sodium carbonate made in 250.00cm� � 0.060 % solution is 0.00261mole � 0.3636% x 10 = 0.0261mole � . (0.3636%+0.060% = 0.4236%) Hence, to find the relative molecular mass: Mole = Mass RMM 0.02661mole � 0.4236% = 2.5061g � 0.004% RMM Therefore, the relative molecular mass for amidosulphuric is 94.18 � 0.4276%. Percentage error = |Experiment value - theoretical value| x 100% Theoretical value = |94.18-97.1| x 100% 97.1 = 3.007% Conclusion: The relative molecular mass for sodium carbonate is 94.18. ...read more.

Conclusion

Theoretically, the colour of methyl orange will change from reddish pink to orange, but when the colour does change to orange, there will be different perception of what is actually orange. Some will consider certain colour is orange while some will not. Therefore, in order to overcome this problem, a controlled conical flask containing methyl orange which colour is orange should be put in front so that the students would know what exactly orange meant. Secondly, when the sodium carbonate is transfer from its container to the beaker to be saluted, some of the particles are not transferred. Instead, they remained in the container. Consequently, the molarities of sodium carbonate are not accurate. Therefore to overcome this error, the container should be wash with distilled water right after the acid is transferred into the beaker. The washing then, too, is transferred to the beaker. : ...read more.

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