PAG 2.3 Identification Of An Unkown Carbonate

Question 1

What are the first 4 steps of the practical

Answer 1

1) Weight the bottle with the unknown carbonate in it
2) Tip the solid into a 250cm3 beaker and re-weigh the empty weighing bottle
3) Dissolve the solid in a bout 100cm3 of distilled water, stirring with a glass rod
4) Transfer the solution to a 250cm3 volumetric flask, using a funnel. Rinse the beaker, glass rod and funnel with distilled water and include the rinsing into the volumetric flask.

Question 2

What are steps 5-8 of the practical

Answer 2

5) make up to just below the mark with distilled water, insert the stopped, and invert slowly several times to mix thoroughly
6) make up the solution to the mark insert the stopped and invert slowly several times to mix thoroughly.
7) using a volumetric pipettes transfer. 25.0cm3 of this solution into a conical flask
8) Add 3-4 drops of methyl orange indicator

Question 3

What are the last 4 stages of the practical

Answer 3

9) using the funnel, rinse and fill burette with 0.100mol/dm3 HCl
10) Titrate the metal carbonate solution with the HCL, with constant swirling until the end point is reached (this is our rough titre)
11) Repeat the titration accurately until you have two consistent concordant results.
12) Ensure you have recorded all results with buretterreadings to the nearest 0.05cm3

Question 4

How do you analyse the results

Answer 4

1. Calculate the mean titre using concordant results
2. Calculate the amount in mol, of HCL in your mean titre
3. Using the equation provided calculate mol of the carbonate
4. Calculate the mol in the 250cm3 of solution u prepared
5. Calculate the molar mass of the carbonate
6. Calculate the rfm of the metal in the carbonate
7. Using the periodic table work out the identity of the metal.