RECOVERING SALT FROM A SOLUTION
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Purpose:
�To recover the salt from a neutralization reaction.
Materials and Preparation
? Provide the following items at each station:
Hydrochloric acid 1 ���� ����������������������������������� sodium hydroxide (2)��� �����������
pH paper (1)��������������������������������������������������� Salt, sodium chloride (1)����������������������
25 mL of 0.3M hydrochloric acid, HCl� 25 mL of 0.3M sodium hydroxide,�������
NaOH in a dropping flask�������������������������������� 250-mL beaker
two 50-mL graduated cylinders������������ stirring rod
hot plate or drying oven����������������������������������� balance
pH paper��������������������������������������������������������� evaporating dish����������� watch glass
ring stand �������������������������������������������������������� burner������������������������� clay triangle
pipet and pump
Safety
1. Caution students to wear safety goggles during the procedure.
2. Warn students to be careful of the burn hazard with the hot plate, and tell them
that the chemicals are corrosive.
Laboratory Practical Procedure
1. Tell students the desired outcomes for the laboratory practical, and explain the
standards for assessment. Have students prepare a report to record their
procedure, observations, and results.
2. Instruct students to neutralize 25 mL of the 0.3M HCl with the 0.3M NaOH, and
to recover the salt.
a  To neutralize the acid you slowly add the base (NaOH).
b.During this process you should be checking the acidity with pH paper until it reaches a pH of 7.
c.The reaction should no longer be producing gas bubbles.
3. Send students, one per station, to the test area.
4. Have students explain their procedure, and measure the amount of salt
recovered. Tell students to turn in the recovered salt, in a labeled sample bottle,
with their report.
Questions to answer
1. students to write a balanced equation for the reaction.
2.  Determine the   type of reaction.
3.  Write a net  ionic equation showing all parts
4.  Why must we  take the ph of the solution?
5.   Explain any sources of error.
Disposal
Provide disposal instructions and/or labeled waste containers at each station.
DATA:
Starting   pH of HCL
Starting   amount of HCL
Trial
Starting   pH of NaOH amount   of NaOH added pH   of mixed substances
notes   about reaction
make a table of the above information
Analysis:
Provide answers to questions below.
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