Chem Lab Word Determination of the Gas Constant R

Topics: Ideal gas law, Pressure, Chlorine Pages: 17 (1386 words) Published: December 8, 2013
IB Chemistry SL (Jr)
Candidate: Yunha Kim

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Determination of Gas Constant R
through Mg and HCl Reaction
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IB Chemistry SL (Jr)
Candidate: Yunha Kim
Objective

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Candidates will react Magnesium with Hydrochloric acid and collect Hydrogen. The grams of the produced Hydrogen will be calculated and compared to the theoretical yield of Hydrogen.

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Controlled Variables
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Mass of Magnesium Ribbon

This will be kept constant as the objective is to
determine the Gas Constant (R). If this is
influenced, then the overall yield will be affected as
the amount of hydrogen produced will be altered.
The mass will be controlled using a Scale.

Amount of Hydrochloric acid

The amount will be consistent throughout the
practical work. Similarly to the mass of Magnesium
Ribbon, when the amount is altered, the overall
yield will be influenced as well.

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Apparatus/Chemicals
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Thermometer

Scale

100ml beaker (±0.05ml)

Eudiometer

100ml graduated cylinder (±0.05ml)

Distilled water

Copper wire

Tap water

Rubber stopper (one-holed)

Magnesium ribbon

Buret clamp

10ml Hydrochloric acid

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Diagram
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IB Chemistry SL (Jr)
Candidate: Yunha Kim

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Data Collection and Processing
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Raw data
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Trial 1
Volume of H2/ (±0.05ml)

Trial 2

Trial 3

36,5

30,1

30,1

Mass of Mg/ (±0.01g)

0,028

0,035

0,031

Temperature of H2O/
(±0.05°C)

18,0

18,5

19,0

Temperature of H2O/
(±0.05K)

291,2

291,7

292,2

101,40

101,40

101,40

Higher Water Level
(±0.05cm)

21,5

24,5

28,5

Lower Water Level
(±0.05cm)

12,5

11,0

13,5

Pressure of Atmosphere/
(±0.005kPa)

* The temperature is converted to Kelvin from Celsius for the significance of this lab.

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Qualitative Observation
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I.

Bubbles that vary in sizes form from the copper (Cu) coiled magnesium (Mg) travel upwards the eudiometer.
II. The bubbles are the hydrogen gas (H2) formed and the hydrogen gas fills the space at the top of the eudiometer.
III. The distilled water decreases in volume and the hydrogen gas fills that space. IV. Bigger bubbles occur when magnesium and hydrochloric acid (HCl) progress to react. V. Small bubbles surrounding the copper wire.

VI. As the magnesium starts to dissolve, the reaction between the magnesium and hydrochloric acid becomes very active.
VII.As a result of this active reaction, more white-coloured bubbles begin to form. VIII.Through the one-holed rubber stopper, MgCl2 is coming out. IX. MgCl2 seems oily, wavy, and comes out as a long thread.

X. MgCl2 and Hydrochloric acid dissolve in the beaker.
XI. When the magnesium is almost entirely dissolve, the reaction progresses very rapidly, forming bigger bubbles, and the volume of distilled water decrease to a greater extent. XII.As the magnesium is completely reacted, no more bubbles form, and the volume of the distilled water is maintained.

XIII.The thread-like wavy MgCl2 is no longer coming out as there is no magnesium left. XIV.The colour of the copper wire is faded out but it is intact.

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IB Chemistry SL (Jr)
Candidate: Yunha Kim

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Calculation
*Following sample calculations are only for trial 1. Trial 2 and 3 are processed using the same calculations.

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Chemical Equation for the Reaction
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Mg +2HCl → MgCl +H
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Water depth
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Water Depth = Higher Water Level - Lower Water Level
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= (21.5 ±0.05) - (12.5 ±0.05)
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= (21.5 - 12.5) ± (0.05 + 0.05)
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= 9cmH O ± 0.1
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(s)

(aq)

2(aq)

2(g)

2

Pressure of Water (l)


1mmHg = 1.36cmH2O(l)1

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760mmHg = 101.325kPa (STP)

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Pressure of Water (g)

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"Pressure Conversion." Pressure Conversion. Weill Medical College of Cornell University, n.d. Web. 30 Nov. 2013. .

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