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Experiment 27 – Acid RainRavi JindalLab Conducted: 11/6/13Report Due: 11/13/13Section: B03TA: RyanLap Partners: Mike Davidson, Rebecca Cohen, Ahbi MalhotraHonor Pledge: I did not copy this work from other students or old lab reports.Signature: ___________________________________Ravi Jindal
Data and Results:A. Using a Colorimetric Indicator to Qualitatively Identify Relative AcidityTable 1. Observations of Effects of Compounds on Rain WaterDropCompoundColor of IndicatorAcidity Relative toRain Water12M C2SO4Yellow/ greenMore2Distilled water that has beenequilibrated with atmospheric CO2GreenSame32M NH4OH ,NH3(aq)BlueLess41M NaHCO3BlueLess50.5M NaNO2BlueLess60.5M Na2SO3BlueLess7Indicator Only GreenlessWhat Color Indicates the Presence of CO2in saturated water?Why is Bromocresol green a good indicator for this set of experiments?Write a Chemical Reaction for the Dissociation of each salt the Correlates with the color of the rainwater indicator.2
22. During the process of diffusion, the smallest drops were the first to change color. Over time, all of the drops changed from a greenish color to a yellowish color. This was a sign that the pH had decreased and the drops became more acidic. The second portion involved the addition of NH3.The drops originally turned blue (indicating an increase in pH) but eventually turned back to yellow after some time had passed. What reaction is taking place in the drops? How do you know?