Chem Lab 1A Essay

Adam Meyer
18 Feb 2015
Experiment 1A

The production and testing of
Ca(OH)₂ with other substances
Refer to pgs 1-8 for more laboratory information.

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Our Objectives
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Observe the reaction between limewater and carbon dioxide; and to test the gaseous products of two chemical reactions for the presence of carbon dioxide. ( refer to the textbook pg 1 for further instruction.)
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Materials and Procedures
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( refer to the text book pg 1-2 for a full list of materials.)
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Observations and Data
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In part IV Testing for Carbon Dioxide we observed that when we exhale through the tube into the erlenmeyer, the limewater goes from a clear, transparent colour to a white, hazy, fog like colour. Smaller white bubble began to form along the inside of the flask. As a final result the new murky, white substance is created with Ca(OH)₂ and CO₂.
In part V Testing Gases with Limewater.
1. In the first gas test with limewater, we combined HCl and Mg. When we place the magnesium (s) into the hydrochloric acid (aq) the magnesium instantly began to fizz and dissolve. The combination of HCl and Mg created a gas which traveled from one flask to the other through the glass tubing, the gas created bubbles in the limewater as it tried to escape. When the Mg was more or less completely dissolved and all movement stopped, the limewater retained its clear, transparent colour. Condensation had formed on the inside of the limewater flask, this shows that the reaction exothermic.
2. In the second gas test with limewater, we combined HCl and Na₂CO₃. When we place the sodium carbonate (s) into the hydrochloric acid (aq) the substance quickly began to fizz and bubble a white colour. As the fizzing got weaker and weaker the substance returned to its transparent state. the dissolving process happen quite rapidly, the gas created by the solution tries to escape through the limewater flask. as it filters though the limewater it becomes a murky, white substance similar to the from before.

EXPERIMENT 1A

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Part V Testing Gases with Limewater (continued)
Table #1
Hydrochloric Acid/
Magnesium Reaction

Hydrochloric Acid/ Sodium
Carbonate Reaction

Temperature before

22ºC

22ºC

Temperature after

25ºC

25ºC

What happens in the reaction

I believe the reaction created a gas, however i do not believe it was CO₂.

I believe the reaction created
CO₂ because the two final result had similar qualities.

What happens to the limewater

It remained a clear colour

It changed into a murky, white substance.

Mass of Beaker : 140.5g
Mass of Beaker + calcium hydroxide : 143.5 g
Mass of calcium hydroxide alone : 3g

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Analysis and Results

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In part IV Testing for Carbon Dioxide.
Ca(OH)₂ (aq) + CO₂ (g) → CaCO₃ (s) + H₂O (l)
Limewater Ca(OH)₂ (aq)
Exhale CO₂ (g)
(Product) Calcium Carbonate CaCO₃ (s) and Water H₂O (l)
In part V Testing Gases with Limewater.
1. HCl and Mg.
2HCl (aq) + Mg (s) → H₂ (g) + MgCl (aq)
Hydrochloric acid HCl (aq)
Magnesium Mg (s)
(Product) Hydrogen H₂ (g) and Magnesium Chloride MgCl (aq)
The gas released into the Limewater flask is H₂ (g)
2Ca(OH)₂ (aq) + 2H₂ (g) → 2Ca (s) + 4H₂O (l)
Limewater Ca(OH)₂ (aq)
Hydrogen H₂ (g)
(Product) Calcium Ca (s) and Water H₂O (l) 

EXPERIMENT 1A

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2. HCl and Na₂CO₃
2HCl (aq) + Na₂CO₃ (s) → CO₂ (g) + H₂O (l) + 2NaCl (aq)
Hydrochloric acid HCl (aq)
Sodium Carbonate Na₂CO₃ (s)
(Product) Carbon dioxyde CO₂ (g) , Water H₂O (l) and Sodium Chloride NaCl (aq)
The gas released into the Limewater flask is CO₂ (g)
Ca(OH)₂ (aq) + CO₂ (g) → CaCO₃ (s) + H₂O (l)
Limewater Ca(OH)₂ (aq)
Carbon dioxyde CO₂ (g)
(Product) Calcium Carbonate CaCO₃ (s) and Water H₂O (l)
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Questions and Follow-Up Questions

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Questions
1.Yes carbon dioxide was produced in the second reaction of Part V
2HCl (aq) + Na₂CO₃ (s) → CO₂ (g) + H₂O (l) + 2NaCl

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