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THE PH VALUE THE ELECTRICAL CONDUCTIVITY OF A SOLUTION JOOYEON PARK AIM To know how to check the PH value of a solution and to see the relationship between the PH value and the electrical conductivity MATERIALS Universal indicator litmus phenolphthalein water 6 beakers wires light bulbs test tubes metal conductors solutions of BaOH2 NaOH Na2CO3 CuSO4 H2SO4 CH3COOH NH3H2O METHOD Place a drop of each solution and water on universal indicators Then use the color to find out the pH values of the solutions After that put a little amount of BaOH2 and H2SO4 into different test tubes two test tubes of BaOH2 and two test tubes of H2SO4 Place drops of litmus to two test tubes one test tube of BaOH2 and another of H2SO4 and place drops of phenolphthalein one test tube of BaOH2 and another of H2SO4 and see the change of color of two different indicators in two different solutions Then pour CH3COOH and place couple drops of NaOH into a test tube and mix them Check whether it resists the change of the pH values Then pour pure water and the solutions of H2SO4 BaOH2 CH3COOH NH3H2O into the beakers each solution in a beaker And place a metal conductor in the beakers with solutions and connect it to the wires that are connected to 5 different light bulbs When connected turn on the power and compare the brightness of the light bulbs connected to different solutions Then try this again with the mixture of BaOH2 and H2SO4 ANALYSIS For the values of pH we got BaOH213 NaOH12 Na2CO312 CuSO43 H2SO41 CH3COOH4 NH3H2O11 and pure water7 The color of litmus changed to red when it met H2SO4 and changed to blue when it met BaOH2 There was no color when phenolphthalein was dropped into H2SO4 when it changed to red when it was dropped into BaOH2 The combination of CH3COOH and NaOH resisted
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