Postlab for Phun with Phosphates Lab - Laboratory Write-up for Phosphate Buffers Chemistry 112 Lab Section 005 A Research Questions 1 What pH did the

Postlab for Phun with Phosphates Lab - Laboratory Write-up...

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Laboratory Write-up for Phosphate Buffers Chemistry 112 Lab Section 005 November 12, 2014 A.Research Questions1.What pH did the buffer components combined into a buffer solution have?2.Did the buffer solution or H2O maintain their pH better when acid or base was added? B. Observations and Results Tables Table 1. Buffer Solution Volume (mL) 100.0 Concentration (M) 0.0502 pH 6.36 Table 2. Buffer Components Component Molar mass (g/mol) Mass (g) mols Na 2 HPO 4 ·7H 2 O 268.07 0.268 0.00100 NaH 2 PO 4 ·H 2 O 137.992 0.555 0.00402 Table 3. Solution Buffering Ability Experimental Measurement pH DI water 8.10 Phosphate buffer 6.36 Buffer + NaOH 6.47 Buffer + HCl 6.26 NaOH in H 2 O 11.00 HCl in H 2 O 2.96 Calculated Prediction pH NaoH in H 2 O 11.3 HCl in H 2 O 2.7 NaOH in Buffer 6.71 HCl inBuffer 6.49 Calculations and Analysis Calculations and analysis are attached on a piece of notebook paper.

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