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Chemistry Design Prac Electrical Conductivity of Salt Solutions

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Introduction

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 (�S/cm) ...read more.

Middle

Controlling Variables Table 3|Variables and Method of control Type Variable Method of control Why is it to be controlled Controlled Volume of sodium chloride solution Measured using a 100mL cylinder (+0.5mL) All errors in measurement will be consistent The temperature under which the reaction occurs All reactions will be conducted under the same lab conditions Errors regarding environment are the same throughout The electrical conductivity meter used to measure the electrical conductivity The same electrical conductivity meter will be used throughout the experiment The degree of error will remain the same. ...read more.

Conclusion

- 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 has stabilised, record the results and observations. 4. Repeat steps 1-4 using 0.1 mol dm-3, 0.5 mol dm-3, 1.0 mol dm-3, 1.5 mol dm-3 and 2.0 mol dm-3 sodium chloride solution. Table 4|Electrical Conductivity for Sodium Chloride Solutions Sodium Chloride Solution Concentration (mol dm-3) Electrical Conductivity of Solution (�S/cm) 0.0 0.1 0.5 1.0 1.5 2. ...read more.

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