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Refrigeration and Air Conditioning Technology
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Chapter 31 / Exercise 6
Refrigeration and Air Conditioning Technology
Silberstein/Tomczyk
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Lab 11: Phun with Phospate Jazmin Agee Lab Partner: Chris H. and Bri W.CHEM 112L-008April 12, 2016A.Research Questions a.What are the buffer components and measured pH?b.What s the ability of the buffer to maintain pH when acid or base was added compared to water (when acid or base was added)?B.Observations and Results Table 1. Personal Assignment Data Volume (L).1 LConcentration (M).100 MpH6.40Table 2. Buffer Recipe ComponentMolar Mass (g/mol)Mass (g)MolesAcidic or BasicNa2HPO47H2O267.96 g/mol.185 g000134 molAcidicNaH2PO4H2O1337.98 g/mol2.32 g0.00866 molBasicTable 3. Measured pH Values vs. Calculated pH values.pH (measured)pH (calculated prediction)DI water6.267.0Phosphate buffer7.756.4Buffer + NaOH7.788.62Buffer + HCl7.567.73NaOH in H2O10.9311.31HCl in H2O5.752.72Calculations-see lab notebook page 69 and 71C.Claims The buffer components added were 0.185 g of NaH2PO4H2O and 2.32 g of Na2HPO47H2O. The pH measured when components were mixed with DI water was
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Refrigeration and Air Conditioning Technology
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Chapter 31 / Exercise 6
Refrigeration and Air Conditioning Technology
Silberstein/Tomczyk
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