Salinity ExperimentAimTo determine a method of measuring a soil samples salinity level in order to measure 3 samples salinity level. HypothesisI 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 samples salinity level. VariablesControlled Amount of solution (100 mL), supplied voltage (4V), amount of soil (50 gm) & water (150 mL) in soil samples solution. Independent Amps recorded by ammeter. Uncontrollable Impurities dissolved into water.
MaterialsPower 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. Method1) 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 diagram2) Record amperage from ammeter. 3) Repeat steps 1 & 2 for 0.
5, 1, 1. 5, 2, 2. 5, 3, 3. 5 mols NaCl solution.
4) Observe results for a pattern linking salt level and amperage. 5) Mix soil and water to dissolve salt from soil. 6) Filter mixture to remove soil. 7) Run current through sample as in step 1. 8) Record amperage.
9) Repeat steps 5-8 for other soil samples. 10) Compare these results to the previous results to find salinity levels of dirt samples. ResultsTable of Results for NaCl solutions. Concentration (mols)Amperage (mA)0. 1850.
51151. 01501. 52002. 02302. 52953. 03703.
5425Graph of results for NaCl solutions. Table of results for soil samplesSample IDAmperage (mA)1 In front of science room402 Oval103 Backyard15Explanation of ResultsThe amperage of the soil samples is very low compared to that of the NaCl solutions. This means that there is very little to no traces of salt in the chosen soil samples.
