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The purpose of this experiment is to prepare a standard solution of sodium carbonate.

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Introduction

Name: CHAN CHI HEI Class: 6LS Class no :1 Date :5/10/2009 Title: prepare a standard solution Date of experiment : 15/09/2009 Aim : to prepare a standard solution of sodium carbonate Aim The purpose of this experiment is to prepare a standard solution of sodium carbonate. Theory: Standard solution means that a solution with known molarity. Standard solution can be use as titration which is used to find out the concentration of other solution. Requirements watch glass/weighing bottle, spatula, sodium carbonate Na2CO3, 250 cm3 beaker, wash bottle of distilled water, glass rod, 250 cm3 volumetric flask, filter funnel, dropper Procedures 1. Transfer 2.65 g of Na2CO3 onto the watch glass/weighing bottle and weigh it to the nearest 0.01g. 2. Put the solute into the beaker, and wash down the rest with the wash bottle. ...read more.

Middle

2.645 g Amount of sodium carbonate, n= m/M 0.025 mol Volume of solution , V 0.25 dm3 Concentration of the sodium carbonate solution 0.1 mol/dm3 Discussions 1. What effect would each of the errors described below have on the concentration of sodium carbonate? a) Some of the solid sodium carbonate was spilled in making the transfer. The concentration of sodium carbonate will record a lower value than its true value because by n=m/M , since mass decrease, the number of mols of Na2CO3 will decrease. Then Concentration of the Na2CO3 is calculated by (no of mol of Na2CO3/Volume of solution) so that when no of mol of Na2CO3 decrease , the concentration will decrease. b) ...read more.

Conclusion

If we missed some of the steps , the concentration of the solution can be greatly affected. For example, while we are weighting the Na2CO3, the top of the balance my contain some Na2CO3 , to make sure the experimet is accurate , we have to clean the solid on the top of the balance first . Also , we need to use washing the bottle to wash the beaker 2-3 times to make sure all the Na2CO3 is transferred into the volumetric flask. Besides , when we are adding the water to the graduation mark , our eye level must be same as the graduation mark . Also , we need to make the Na2CO3 solution in volumetric flask upsaide down to make sure that it is evenly distributed. Conclusion The molarity of the standard solution is 0.1mol/dm3 . ?? ?? ?? ?? 1 ...read more.

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