Calculate the final concentration of Cu(NH₃)₄SO₄ (in mol/L) of solution #2 if the mass of CuSO₄*5H₂O used is 0.669 g. Assume that the dilution procedure is the same as outline in the procedure you will follow in the lab. Provide the result without unit but numerical values only.

The molar mass of CuSO₄*5H₂O = 249.68 g/mol

1. Set up a buret as described in the Useful lab techniques (p. Error! Bookmark not defined.) section in this manual. Clean with distilled water, then rinse the buret with a few millilitres of NaOH solution (~ 0.1 M). Fill the buret with the NaOH solution and make sure that the buret tip is filled with solution. 2. Pipet 15.00 mL of your KHP solution into a clean 250 mL Erlenmeyer flask. (CAN BE WET) 3. Record the initial volume of liquid in the buret, estimating to two decimal places. 4. Add 2-3 drops of phenolphthalein indicator to the flask containing the KHP solution. 5. Titrate, making sure that you are constantly swirling the contents of the flask. The endpoint has been reached when the first permanent pink colour has been achieved. The colour of the indicator should remain for at least 15 seconds after the last addition of the base solution. 6. Record the final volume of liquid in the buret, again estimating to two decimal places. 7. Repeat steps 2-6 for a for two more trials. If needed, add more NaOH solution to the buret. rt III: Titration of unknown HCl with NaOH solution 1. Fill the buret with NaOH solution. a 2. Pipet 15.00 mL of an unknown HCl solution into a clean 250 mL Erlenmeyer flask. 3. Record the initial volume of liquid in the buret, estimating to two decimal places. 4. Add 2-3 drops of phenolphthalein indicator to the flask containing the unknown HCl solution. 5. Titrate the acid sample to a pale pink endpoint that remains for at least 15 seconds. 6. Record the volume in the buret once the endpoint has been reached. 7. Repeat the titration once more with another 15.00 mL aliquot of the unknown HCl solution