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If I double the concentration of Sodium Chloride ions in a solution the current that can flow through the circuit will also double.

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Introduction

Vicki Speak

Chemistry Coursework

Prediction

If I double the concentration of Sodium Chloride ions in a solution the current that can flow through the circuit will also double.

Controlled Variables

  • Temperature: Room temperature-15ºc
  • Voltage: 6V
  • Volume of water: 200cm³
  • Equipment: see diagram

Diagram

How to make the concentration

  • 0.5M = 5.85g in 200cm³
  • 1M = 17g in 200cm³
  • 1.5M = 22.85g in 200cm³
  • 2M = 34g in 200cm³
  • 2.5M = 39.85g in 200cm³

Method

  • Set up all the equipment
  • Switch on the circuit
  • Write down the first current seen
  • Switch the circuit off.

Results

Using different equipment

Using the same equipment

Concentration (m)

Current (A)

Current (A)

0.5

0.44

1.92

1

1.93

1.73

1.5

1.98

2.07

2

2.22

2.41

2.5

1.16

2.55

Analysis

I found out that the results follow a trend.  The trend is that the points on the graph are in a straight line, which curves off towards the top right hand corner of the graph.  The last

...read more.

Middle

Concentration

Actual Current (A)

Ideal Current (A)

0.5 M

0.92

1M

1.73

1.84

2M

2.41

3.68

Evaluation

Good Points

Bad points

The results were easy to record.

There were anomalies in the evidence.

It was easy to carry out the experiment.

As the concentrations were high we did not achieve the expected results.

The results were repeatable, as we did the experiment and got the same results.

Using different equipment gives different results.

The current always measured to two decimal places.

I didn’t measure volume or mass.

The electrodes were unsteady.

Anomalies in the evidence

What was it?

What should it have been?

0.5M: 0.92A

0.8A

1M: 1.73A

1.6A

1.5M: 2.7A

2.2A

2M: 2.41A

2.50A

2.5M: 2.55A

2.80A

Scientific Explanation of the Anomalies

The reason there were anomalies in the evidence could have simply been due to there being too many extra gases.

...read more.

Conclusion

age (V)

Current (A)

0.0125

18

6

0.04

0.025

18

6

0.09

0.05

18

6

0.16

0.1

18

6

0.27

0.2

18

6

0.47

0.3

18

6

0.64

0.4

18

6

0.78

0.5

18

6

0.93

0.6

18

6

1.02

0.7

18

6

1.15

0.8

18

6

1.31

0.9

18

6

1.47

1

18

6

1.59

The results turned out how I had expected them to, which means I was right to think that if the concentrations were lower the prediction would be correct. This is because as the concentration gets higher more Sodium reacts with the water in the beaker, and more Chlorine gas, together these reactions form bubbles and these bubbles form on the electrodes, which makes it harder for the ions to get to the electrodes.  Therefore as the concentrations were lower there must not have been as many reactions occurring, leaving it easier for the ions to get to the electrodes.

...read more.

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