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Effect of concentration on Nacl solution

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Introduction

Table of Contents Introduction 3 Basic idea 3 Properties of salt solutions, which influence their electric conductance: 3 Hypothesis 3 Variables: 4 Plan for experiment 4 Materials: 5 Experimental set-up Diagram 5 Steps of the experiment: 6 Safety precautions 6 Solutions preparation 6 Measuring the conductivity / amount of electricity created 6 Making observations: 7 Cleanup: 7 Data and Observations 7 Conclusion 8 Evaluation: 9 Fair testing: 9 Follow up Experiment: 9 References 10 Introduction Basic idea In this assignment we will be focusing on one property, which influences the electrical conductance of an ionic solution. Compounds can be held by a covalent or ionic bond, which depends on the nature of the bonds. In case of ionic compounds (we also call them electrolytes), the force of attraction is present between the ions, which have opposite charge. One of the ions has a positive charge, which is called a cation, and the other has a negative charge, which is called an anion. This attraction is called an ionic bond. Ionic compounds1 form crystals in which anions and cations are held together with force of attraction. ...read more.

Middle

2. Take out 4 glass beakers and set them out on the table. Solutions preparation The solution chosen is NaCl. In the five different beakers, there will be different amounts of water and different amount of concentrations of NaCl will be added. The amount of water will decrease with the increase of concentration as to keep the same volume of the solution, which is 100 ml in total for all 5 cases. These 5 solutions are prepared in 5 different beakers. We use a measuring cylinder to measure the amount of water and measuring beaker for NaCl solution. 1. 1st solution -Take 95ml water in a beaker and then add 5ml of NaCl solution. 2. 2nd solution - Take 90 ml water and then add 10ml of NaCl Solution. 3. 3rd solution - Take 85 ml of water and then add 15 ml of NaCl Solution. 4. 4th solution - Take 80ml water and then add 20 ml of NaCl solution. 5. 5th solution - Take 75 ml of water and then add 25 ml of NaCl solution. Measuring the conductivity / amount of electricity created 1.To measure the electric conductance, we need to first create a circuit by using a pair of copper electrodes. ...read more.

Conclusion

In my view we were also extremely organized in the experiment as we knew exactly what we had to do , and any small mistakes which we made we were able to solve them. Fair testing: There should be reasonable difference in the concentrations of the NaCl solutions used for the experiment to get more reliable result. Keep electrodes for sometime in each solution, and as soon as the reading is stable, note it down on your table. Stir the solutions properly before putting electrodes into it to make sure that NaCl has mixed properly with water in each case. Clean and dry electrodes before putting them into different solutions. The amount of the voltage applied should be the same in each case. Follow up Experiment: We are investigating on the various factors that influence the conductance of an ionic solution. In this experiment we concentrated on how the concentration of a solution affected the conductance. So the follow up experiment should be focusing on another influential factor, which in my view should be how temperature influences the conduction of an ionic solution. I also find this a really interesting topic to continue investigation on. This experiment will give us an even better understanding of conductance and electrolytes. ...read more.

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