chemExp9 - K(aq Br(aq → N.R Indicator 2 Bracketing K 2 SO...

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Acids, Bases and Buffered Systems Excel Template Chem1310 Laboratory Copyright (c) 2003 Tatsuya Maehigashi Chem1310 Margin Name: Patrick Eisenmann Partner's Name: Jace Dalton Section: G1 Date of Experiment Performed: 11/21/2006 Date of Report Prepared: 11/24/2006 Acids, Bases and Buffered Systems A. pH Using Indicators C. pH of Salt Solutions 2 Salt pH Chemical Equations 4.0 NaCl 4.840 Methyl Orange KBr 6.950 Bromcresol Green 4.600 4 7.815 4.7 5.700 4.4 11.700 4.922 3.865 1.791 E. Properties of a Buffered Solution B Solution pH Solution pH 7.00 6.9 Deionized (DI) Water 5.700 1.00E-07 Buffer + HCl** 6.83 DI Water + HCl 3.14 1.00E-07 Buffer + NaOH** 6.91 DI Water + NaOH 10.70 2.000 Buffer + HCl** 2.000 Buffer + NaOH** 2.077 *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
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Unformatted text preview: K + (aq) + Br-(aq) → N.R. Indicator 2 Bracketing K 2 SO 4 2K + (aq) + SO 4-(aq) → N.R. pH known, Lower NaC 2 H 3 CO 2 NaC 2 H 3 CO 2 + H2O ↔ Na + + HCO 3-+ H 3 O + pH known, Higher NH 4 Cl NH 4 Cl + H 2 O ↔ NH 4 + (aq) + Cl-pH Unknown, Best estimate K 2 CO 3 K 2 CO 3 + H 2 O ↔ 2K + + HCO 3-+ OH-(NH 4 ) 2 SO 4 (NH 4 ) 2 SO 4 + H 2 O ↔ 2NH 4 + + HSO 4-+ OH-CuSO 4 Cu(H 2 O) 4 2+ ↔ Cu(H 2 O) 3 (OH) + + H + FeCl 3 Fe(H 2 O) 6 3+ ↔ Fe(H 2 O) 3 (OH) + + H + D. Determination of K a ID Unknown pH Unknown,half-neutralized Buffer unknown* [H + ] half-neutralized K a Unknown Buffer Std. Ref. A B C D E F G H I J K L M N 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...
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