[PDF] acid base indicator equilibrium lab

15 sept. 2018 · This video describes the concept of Le Chatelier's Principle and its application in the
Durée : 4:44
Postée : 15 sept. 2018Questions associées
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  • What is the equilibrium of an acid-base indicator?

    In an acidic solution, equilibrium is to the left, so the solution is colorless (too little magenta anion to be visible), but as pH increases, the equilibrium shifts to the right and the magenta color is visible. which is the point where half of the indicator is in acid form and the other half is its conjugate base.

  • What are acid-base indicators used in the lab?

    Common Acid-Base Indicators
    Tried-and-true indicators include thymol blue, tropeolin OO, methyl yellow, methyl orange, bromphenol blue, bromcresol green, methyl red, bromthymol blue, phenol red, neutral red, phenolphthalein, thymolphthalein, alizarin yellow, tropeolin O, nitramine, and trinitrobenzoic acid.

  • How do you know where equilibrium lies in an acid-base reaction?

    Any Acid-Base reaction favors the formation of a weaker acid and a weaker base.

    1 Identify the acid and the conjugate acid of the base: 2 Look up the pKa values of the acid the conjugate acid: 3 Write the reaction equation pointing to the equilibrium position with a longer arrow:
  • When we add acid to a solution of methyl orange, the increased hydronium ion concentration shifts the equilibrium toward the nonionized red form, in accordance with Le Chatelier's principle. If we add base, we shift the equilibrium towards the yellow form. This behavior is completely analogous to the action of buffers.
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