3/3-Lab Procedure-How Much Water/Salt?

Samantha Karp
3/3/09
Lab Procedure

Given: 6M NaOH (aq) + 12M HCl (aq)→ H2O + NaCl
How much water and how much salt?
Water-1. From the reaction
2. From the reactants, already have the water.
Procedure
1. Measure out 50 mL of the 6M NaOH and 100 mL of the 12M HCl in a graduated cylinder.
2. Find the mass of two empty Erlenmeyer flasks. Record these amounts. Label the Erlenmeyer flasks.
3. Pour the 50 mL of the NaOH solution into the Erlenmeyer flasks.
4. Find the mass of the solution. Record this amount.
5. Using a hot plate or a burner, place the Erlenmeyer flask full of the NaOH solution above the flame. This will eventually evaporate the water, leaving only the NaOH.
6. Find the mass of the NaOH. Record these results.
7. Subtract the mass of the NaOH from the mass that we found in step 4. This will give you the amount of water that is in the solution.
8. Repeat steps 3-7 with the HCl solution.
9. Repeat step 1.
10. Pour the two solutions into another Erlenmeyer flask. Shake until dissolved.
11. Find the mass of the solution.
12. Using a hot plate or a burner, place the Erlenmeyer flask above the flame. This will eventually evaporate the water out, leaving only the salt.
13. Find the mass of the salt. Record these results.
14. Subtract the amount of salt from the total mass. This will give you the amount of water.
15. Record your results and data.


Questions to Ask in Class:
Will the glass burn if it is under the burner?
Do we need to collect the steam?