19.BuffersIndicators

19.BuffersIndicators - NaCl and NaOH C HCN and NaCN D NH 4...

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Acids Lesson 8 Buffers Indicators
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Buffer Solutions Buffer solutions are equilibrium systems, which maintain a relatively constant pH when small amounts of acids or bases are added. Acid Buffer Recipe Weak Acid + Salt (conjugate) HF NaF Buffer Equation Same as weak acid HF H + + F -
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HF H + + F - [High] [low] [High ] [HF] is high and [H + ] is low because HF is a weak acid. [F - ] is high due to adding the salt NaF . This buffer solution can shift left or right and the [H + ] and the pH remains fairly constant .
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Base Buffer Recipe Weak Base + Salt (conjugate ) NH 3 NH 4 Cl Buffer Equation Same as weak base NH 3 + H 2 O NH 4 + + OH - [High] [High] [Low]
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Fill in the blanks to get buffer solutions . Acid Base HCN NaCN NaHCO 3 H 3 PO 4 KCH 3 COO NH 4 Cl Na 2 CO 3 NaH 2 PO 4
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Buffer Application 1. Pick the two buffer solutions A. NH 4 Cl and HCl B.
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Unformatted text preview: NaCl and NaOH C. HCN and NaCN D. NH 4 Cl and NH 3 √ √ 2. Write the equations for the above two buffer solutions. Label the concentrations as high or low. HCN ⇋ H + + CN-[High] [Low] [High] NH 3 + H 2 O = NH 4 + + OH-[High] [High] [Low] 1. A few drops of 0.10 M NaOH is added to a buffer solution at pH = 5.00. The new pH could be: A 4.98 B. 5.02 C. 8.05 D. 2.11 √ Acid Base Yellow Red Shift Colour At pH < 10.1 Left Yellow [HInd] > [Ind-] At pH > 12.0 Right Red [HInd] < [Ind-] At pH = 11.05 Middle Orange [HInd] = [Ind HInd ⇋ H + + Ind-Alizarin Yellow Indicators @ the transition point [HInd] = [Ind-] Ka = [H + ] Ka = 10-pH Ka = 10-11.05...
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This note was uploaded on 07/06/2011 for the course SCH 4U taught by Professor White during the Spring '10 term at Beacon FL.

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19.BuffersIndicators - NaCl and NaOH C HCN and NaCN D NH 4...

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