acid buffer lab - 4-(aq) → N.R. pH known, Higher NaC 2 H...

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Acids, Bases and Buffered Systems Excel Template Chem1310 Laboratory Copyright (c) 2003 Tatsuya Maehigashi Chem1310 Margin Name: Miranda Pryor Partner's Name: Cassandra Pryor Section: A4 Date of Experiment Performed: 3/14/2007 Date of Report Prepared: 3/21/2007 Acids, Bases and Buffered Systems A. pH Using Indicators C. pH of Salt Solutions 2 Salt pH Chemical Equations 3 NaCl 5.09 methyl violet KBr 6.85 bromphenol blue 2.8 5.57 3 7.59 2.9 4.77 11.53 5.73 4.56 E. Properties of a Buffered Solution B Solution pH Solution pH 6.87 6.87 Deionized (DI) Water 6.66 0 Buffer + HCl** 6.87 DI Water + HCl 3.38 0 Buffer + NaOH** 6.87 DI Water + NaOH 10.3 3.01 Buffer + HCl** 2.98 Balanced Equation Buffer + NaOH** 3.02 *Half-neutralized unknown acid from D **All HCl/NaOH added was 5 drops ID Unknown pH Unknown, Approx. Na + (aq) + Cl - (aq) → N.R. Indicator 1 Bracketing K + (aq) + Br - (aq) → N.R. Indicator 2 Bracketing NaNO 3 Na + (aq) + NO 3 - (aq) → N.R. pH known, Lower K 2 SO 4 2K + (aq) + SO
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Unformatted text preview: 4-(aq) → N.R. pH known, Higher NaC 2 H 3 CO 2 NaC 2 H 3 CO 2 (aq)+ H 2 O(l) ↔ Na + (aq) + HCO 3-(aq) + H 3 O + (aq) pH Unknown, Best estimate NH 4 Cl NH 4 Cl(aq) + H 2 O(l) ↔ NH 4 + (aq) + Cl-(aq) K 2 CO 3 K 2 CO 3 (aq) + H 2 O(l) ↔ 2K + (aq) + HCO 3-(aq) + OH-(aq) (NH 4 ) 2 SO 4 (NH 4 ) 2 SO 4 (aq) + H 2 O(l)↔ 2NH 4 + (aq) + HSO 4-(aq) + OH-(aq) CuSO 4 Cu(H 2 O) 4 2+ (aq) ↔ Cu(H 2 O) 3 (OH) + (aq) + H + (aq) FeCl 3 Fe(H 2 O) 6 3+ (aq) ↔ Fe(H 2 O) 3 (OH) + (aq) + H + (aq) D. Determination of K a ID Unknown pH Unknown,half-neutralized Buffer unknown* [H + ] half-neutralized K a Unknown Buffer Std. Ref. OH-+HA/A-→HA/A-H + +HA/A-→HA/A-A B C D E F G H I J K L M N O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37...
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This note was uploaded on 04/07/2008 for the course CHEM 1310 taught by Professor Cox during the Spring '08 term at Georgia Institute of Technology.

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