Kalkwasserprobe - so manage the carbon dioxide detection

06-06  Source: Network gathering  Views:5 


Kalkwasserprobe - so manage the carbon dioxide detection

The Kalkwasserprobe as detection reaction of carbon dioxide

The Kalkwasserprobe with a gas

  1. For Kalkwasserprobe you should lime Always make up freshly, since the carbon dioxide contained in the air reacts with the time with the lime, and therefore no proof is possible.
  2. To put the lime water, loosen in an Erlenmeyer flask of calcium oxide in distilled water. It runs following reaction:
    CaO + x H 2 O → Ca (OH) 2 (aq).
    Use Do not tap water, since this carbon dioxide has dissolved.
  3. Seal your flask with the rubber stopper and insert the glass tubes into the rubber stopper so that a tube immersed in the solution and the other tube is in the air space above the solution.
  4. Forward through the glass tube your gas, you want to check for the presence of carbon dioxide, in the lime water.
  5. Occurs a haze, the Kalkwasserprobe is positive. So you gas contains carbon dioxide or sulfur dioxide. The reaction equations for these reactions are as follows:
    Ca (OH) 2 (aq) + CO 2 (g) → CaCO 3 (s) + H 2 O (l)
    Ca (OH) 2 (aq) + SO 2 (g) → CaSO 3 (s) + H 2 O (l).
  6. If the test was positive, forward for a while, the gas in the turbid water, or let stand the test open a few hours. the opacity Disband again, so your sample contained carbon dioxide. The following reaction takes place here:
    CaCO 3 (s) + H 2 O (l) + CO 2 → Ca 2+ + HCO 3 -
    If the turbidity unchanged, so sulfur dioxide contained in your gas.

Carbonatnachweis from a solution or a solid

  1. Enter a small drop of your sample on a Petri dish. If you want to examine a solid with the Kalkwasserprobe, enter a few small pieces of your possible finely ground sample on the pan.
  2. Make with calcium oxide and distilled water in a small beaker little lime. Place a drop of this solution with the pipette to the second Petri dish.
  3. Enter concentrated hydrochloric acid on your sample in the Petri dish and place the second Petri dish with the Kalkwassertropfen inside as quickly as possible on the first Petri dish so that a closed space is formed. The Kalkwassertropfen should hang freely on the upper petri dish still inside.
  4. If relatively promptly enters a haze in the water droplets on the upper petri dish, carbon dioxide is formed, ie carbonate in the sample. The corresponding reaction equations can be found above.
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