Reactions of hydrochloric acid
Aim:
to investigate some common reactions of hydrochloric acid
Materials:
Collect the following for your group….
0.1 M hydrochloric acid (HCl)
1 M hydrochloric acid
(HCl)
0.1 M sodium hydroxide (NaOH)
1 cm magnesium ribbon (Mg)
Solid calcium carbonate (CaCO3)
Solid copper oxide
(CuO)
Stopper and delivery tube
Safety glasses
limewater
methyl violet indicator
universal indicator
colour chart
spatula
4 test tubes
Test tube rack
lab coat
Procedure:
1.
a) Add one drop of universal indicator to a test tube containing 20
drops of 0.1 M hydrochloric acid
b) Add 0.1 M sodium hydroxide drop wise and record any colour
changes.
c) Explain your observations and write an equation for the reaction
that has occurred.
Observation: ____________________________________________
_____________________________________________
Explanation: _____________________________________________
_____________________________________________
Reaction:
_____________________________________________
2.
pH:
a) Add one drop of methyl violet indicator to a test tube
containing 20 drops of 0.1 M HCl. Record the pH of the solution.
What does this tell you about the strength of hydrochloric acid?
____________
Strength of acid _________________________________________
b) Add 10 ml of water to the test tube and then test the pH again.
What do you notice?
___________________________________
3.
Add about 1 ml of 1M hydrochloric acid to a test tube containing
a spatula full of solid calcium carbonate. Test the gas evolved
with limewater.
Observation: ____________________________________________
_____________________________________________
Reaction:
4.
_____________________________________________
Add about 5 ml of 1M hydrochloric acid to a spatula full of solid
copper oxide in a test tube. Shake the test tube and allow to
stand for 5 minutes.
Observation: ____________________________________________
_____________________________________________
Reaction:
5.
_____________________________________________
Add about 10 ml of 1M hydrochloric acid to a test-tube
containing a 1 cm strip of magnesium ribbon. Use an inverted
test tube to collect the gas evolved and test it with a flame.
Observation: ____________________________________________
_____________________________________________
Reaction:
_____________________________________________
Conclusion:
_______________________________________________________
_______________________________________________________
_______________________________________________________
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