I need some serious help for my Chemistry final. We are suppose to find out the conecntration of an unkown sodium carbonate solution. If you have ANY ideas on how I should go forth doing this please respond.
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HELP PLEASE!! (URGENT) how to separate of Sodium Carbonate and water watch
- Thread Starter
- 10-06-2005 00:59
- 10-06-2005 02:42
titrate with HCl solution of known concentration using a suitable indicator such as Methyl Orange.
The reaction is: Na2CO3 + 2HCl -> 2NaCl + H2O + CO2
so the number of moles of HCl used is twice the number of moles in the Na2CO3 solution used. For example:
for 25 cm3 Na2CO3 solution 30 ml of 0.1 mol dm-3 HCl was needed.
Amount of HCl used: 30*10^-3 dm3* 0.1 mol dm-3 = 0.003 mol HCl
Amount of Na2CO3 in 25ml solution: 0.5 * 0.003 mol HCl = 0.0015 mol Na2CO3
Concentration of Sodium Carbonate solution: 0.0015 mol / 0.025 dm-3 = 0.06 mol dm-3
This can then be converted to g dm-3 if needed using the molar mass of sodium carbonate.
Hope this helps