Chemistry Design Prac Electrical Conductivity of Salt Solutions

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Investigate the electrical conductivity of salt solutions

Aim

To determine whether the concentration of sodium chloride in solutions affects the electrical conductivity of the solution

Background

Electrical conductivity is the ability to carry out the flow of an electric current. In solutions, this depends almost entirely on the solute present. Ions are capable of carrying an electrical current. When sodium chloride (NaCl) is dissolved into water, Na+ and Cl- ions are formed, which are able to conduct electricity. Electrical conductivity is measured in microSiemens per centimetre (μS/cm)

Table 1|Chemical Properties of Sodium Chloride Solution

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Defining Independent and Dependent Variables

Table 2|Defining the Independent and Dependent Variable

Controlling Variables

Table 3|Variables and Method of control

Materials and Equipment List

  • Electrical Conductivity meter
  • Measuring cylinder (100mL+0.5mL)
  • Beaker (1 x 250mL+0.5mL)
  • Sodium Chloride Solution (0.1 mol dm-3, 0.5 mol dm-3, 1.0 mol dm-3, 1.5 mol dm-3, 2.0 mol dm-3)

Method

Experimentation:

  1. Measure 100mL of sodium chloride solution (0.0mol) into a 250mL beaker
  2. Insert the electrical conductivity meter into the beaker and swirl gently
  3. After approximately 30-60 seconds or after the electrical conductivity reading ...

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