This document is not meant to be a substitute

ExperimentAcid BaseChemistryAcid/BaseChemistryPortland Community CollegeStaff*Version 42-0137-0001Lab Report AssistantThis document is not meant to be a substitute for a formal laboratory report. The LabReport Assistant is simply a summary of the experiment’s questions, diagrams ifneeded, and data tables that should be addressed in a formal lab report. The intent is tofacilitate students’ writing of lab reports by providing this information in an editable filewhich can be sent to an instructor.Obser vationsIn columns 3 and 4, record the color and intensity seen. In columns 5 and 6, determine ifthe substance is an acid or a base, and if the substance is ionic. For the last column,determine which chemical species is acting as an acid or base.Data Table 1: Acids and Bases Acting in WaterWell Substance1234567891011121314151drop BTBPlus 1 dropofsubstanceNaHCO3CH3COOHHCLNa2CO3H2SO4CH3COONNaOHHNO3NaHSO4NH3H3PO4NaH2PO4Na2HPO4Na3PO4NaHSO3m86Acidorbase(Q1)Ionic? Y/N(Q2)©Hands-On Labs,SpeciesactingasExperimentAcid BaseChemistryData Table 2: Following Acid/Base neutralization reactionsWell#1234567891011121 Drop ofObservatioEachnBPB + NaOHBPB + NaOHBPB + NaOHBPB + NaOHBPB +BPB +BPB +BPB +BPB + NH3BPB + NH3BPB + NH3BPB + NH3+2ObservatioDropsnAcidHClH2SO4CH3COOHH3PO4HClH2SO4CH3COOHH3PO4HClH2SO4CH3COOHH3PO4+2ObservatioDropsnBaseNaOHNaOHNaOHNaOHCa(OH)2Ca(OH)2Ca(OH)2Ca(OH)2NH3NH3NH3NH3Please note here if any of the other starting materials is other than a clear, colorless solution.m88©Hands-On Labs,ExperimentAcid BaseChemistryData Table 3: Investigating Odor as a Means of Indicating Neutralization.Substance(s)2 Drops of HCl in Well #11 Drop of Ammonia onSwab with Ammonia & HClSwabOdorData Table 4: Investigating Evaporation as aMeans ofIndicating a(When Wet)Reaction MixtureObservation Neutralization Observation (When Dry)HCl + NaOHCH3COOH + NH3HNO3 + NaOHm90©Hands-On Labs,ExperimentAcid BaseChemistryPART 5: Mini-Experiments1.Use BTB to classify four household products as acidic or basic. Possiblesubstances to test include home cleaning products, glass cleaner, liquid detergent,bleach, soft drinks, liquid from food items, etc. Remember to:a. Hypothesis (What you think will happen and why) or purpose:b. Method used to test your hypothesis:c. Data and Observations Put your data and observations in the space below. Youcan include pictures that you “draw.”d. Conclusions2. Find one common, highly colored substance that can be used as an acid-base indicator.Possible substances include fruit/vegetable juice or products, inks, food coloring, flowerpetals, etc. If using fresh fruit, veggies, or flowers, crush the substance with a little water orrubbing alcohol to extract the colored pigments. If red cabbage is available, it makes a superbacid-base indicator. Then use a few drops of the colored extract as the indicator. Test fourmore household products using the freshly made acid-base indicator. Remember to:a. State a hypothesis or purpose.m91©Hands-On Labs,ExperimentAcid BaseChemistryb. State the testing method.c. Use the prepared indicator to test four substances known to be acids or basesfrom either the LabPaq or home materials and record results.d. State conclusions in terms of the hypothesis or purpose.m92©Hands-On Labs,ExperimentAcid BaseChemistryQuestionsA. Review the substances used in Part 1. Determine whether each substance containsan acid or a base based on the BTB results. Place answers to this question in column 6of Data Table 1.B.Review the responses to Question 3. The anion that is produced in thedissociation of the compound goes on to react with the water. Identify the anion productin each reaction. Place the formulas for these species into column 7 of Data Table 1. Ifthe substance is not ionic and thus does not dissociate, then list the substance in column7, just as it appears in column 1.C.For each ionic species in Data Table 1, write the equation showing thedissociation of the compound in water. Hint: there’s one for each line provided below.a. NaHCO3 àNa++ HCO3Review the responses to Question 3. The anion that is produced in the dissociation ofthe compound goes on to react with the water. Identify the anion product in eachreaction. Place the formulas for these species into column 7 of Data Table 1. If thesubstance is not ionic and thus does not dissociate, then list the substance in column 7,just as it appears in column 1.m93©Hands-On Labs,ExperimentAcid BaseChemistryD. Write the reaction of each acid or base the substance listed in column 7 with water.Acids:Bases:a) HCO – + H-OH à H CO + OH3231. What is produced in each and every reaction of an acid with water?2. What is produced in each and every reaction of a base with water?m94©Hands-On Labs,ExperimentAcid BaseChemistryE. Review the results in Data Table 2. For each reaction mixture, write the reactionequation describing the acid/base neutralization reaction:2) 2NaOH + H2SO4 à 2H2O + Na2SO4F. Define the term “neutralization” and provide an example of a neutralization equation.List the three ways used in this lab to detected neutralization.G. Define the term “salt,” and provide an example.H. Review Data Table 3. What happened when the two chemicals were mixed? Whatindicates that conclusion? What reaction took place?m95©Hands-On Labs,ExperimentAcid BaseChemistryI. Review Data Table 4. What happened when the solution mixtures on the glassslide were heated? Describe the process that took place.J. In Part 4, for HCl + NaOH, what is left on the slide after heating? Provide the formula.What is the common name of this substance?m96©Hands-On Labs,

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