Lab Report Experiment 10 (Autosaved)

2 use a dropper to add one drop of phenolphthalein to

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2. Use a dropper to add one drop of phenolphthalein to the test tube. 3. While stirring with a glass rod, perform titration by adding drops of 0.5M NaOH solution to the test tube until the equivalence point is reached and the solution changes color. 4. Record the number of drops of NaOH used. 5. Clean all apparatuses used and the desk. Results: Number of drops of NaOH used = volume of the base = 10 Concentration of base = 0.5M Number of drops of HCl used= volume of the acid= 10 n acid =n base C A V A =C B V B C A × 10=0.5 × 10 C A = 0.5M III. Conclusion: Acids turn blue litmus paper red and stay colorless when the indicator phenolphthalein is added. Whereas bases turn red litmus paper blue and turn pink when reacted with phenolphthalein. We observed that magnesium has the highest activity rate with acids, then iron, zinc, and copper lowest. When we reacted acid with calcium carbonate in a closed environment, bubbles were produced that turned lime water milky which indicates that the gas produced is CO 2 . We preformed titration and found the concentration of the acid to be 0.5M. We know that equilibrium is reached and that all the acid is neutralized when the solution turns pink, at the equivalence point.
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