Phun with Phosphate - Phun with Phosphate Taylor Black...

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Phun with Phosphate Taylor Black Cassie Pressnall CHEM 112L & 005April 5, 2016A.Research questions a.What pH did the buffer components combined into a buffer solution have?b.Did the buffer solution or H2O maintain their pH better when acid or base was added?B.Observations and Results Table 1. Buffer SolutionVolume (L)0.100 LConcentration (M)0.100 MpH6.8 pHTable 2. Buffer ComponentsTable 3. Solution Buffering Ability pH (measured)pH (calculated prediction)DI Water 6.20 pHNAPhosphate buffer6.40 pH6.80 pHBuffer + NaOH6.44 pH6.47 pHBuffer + HCl6.37 pH6.32 pHNaOH in H2O10.77 pH10.01 pHHCl in H2O2.61 pH2.71 pHCalculations and Analysis Refer to notebook pagesC.Claims 1.The buffer components formed a buffer solution with a pH of 6.40.2.The buffer solution maintained a stable pH when acid or base was added compared to the unstable pH of H2O when acid or base was added. D.Evidence 1.The buffer components formed a buffer solution with a pH of 6.40. The buffer solution that was made for this experiment consisted of NaH2PO4and Na2HPO4. Theyare a weak acid/base conjugate pair. 0.751 grams of Na2HPO4 and 0.993 grams of ComponentMolar mass(g/mol)Mass (g)MolesAcidic or basicNa2HPO4•7H2O268.07 g/mol0.751 grams2.8x10

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