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Salinity Experiment

Aim
To determine a method of measuring a soil sample's salinity level in order to measure 3 samples' salinity level.

Hypothesis
I think that by running a current through a salt solution and measuring the resultant amperage, a pattern in the recordings will help find a soil sample's salinity level.

Variables
Controlled – Amount of solution (100 mL), supplied voltage (4V), amount of soil (50 gm) & water (150 mL) in soil sample's solution.
Independent – Amps recorded by ammeter.
Uncontrollable – Impurities dissolved into water.

Materials
Power pack; copper electrodes; ammeter; 8 different concentrations of salt solution (NaCl) – 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5 mols; beakers; filter papers; funnel; wires; retort stand; scales; 3 soil samples; distilled water.

Method
1) Pour 100 mL of 0.1 mol NaCl solution onto beaker, place electrodes in solution and run 4V through the circuit as shown in the following diagram

2) Record amperage from......

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Approximate Word Count: 283
Approximate Pages: 2 (250 words per double-spaced page)

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