*ik geef hieronder de tekst met de nodige correcties weer*
We want to know the concentration of salt in water after boiling the green beans.
*koken wordt alleen met to cook vertaald als het over het klaarmaken van eten gaat*
We boil the green beans at a temperature of 100 degrees during 1 minute. We put the green beans in a solution with different concentrations of NaCl, because after the experiment we can measure the increase of salt for each concentration of NaCl.
So first we need a burner, five beakers, 15 green beans and a weighing machine. We put three green beans with almost the same size in each beaker. We take five beakers and fill each one with a different concentration of NaCl. We let the contents in each beaker boil for 1 minute. Then we weigh the five beakers and fill them up with demineralised water, because during the boiling the water evaporates.
*than wordt alleen gebruikt als je bepaalde dingen met elkaar wilt vergelijken*
We need to fill each beaker up, otherwise the concentration of NaCl changes. We take the green beans from the beakers.
The second step is titration. With titration we can measure the concentration of NaCl in the beakers. We need a buret, a pipet, an indicator and some AgNO₃. We put the AgNO₃ in the buret. With the pipet we measure 10 mL of the solution of NaCl from each beaker and put each sample in a separate conical flask. We put three drops of a potassium chromate solution (it is the indicator) in each conical flask. We put the conical flask under the buret. We measure the AgNO₃ that we put int the buret. We let the AgNO₃ drip into the conical flask until the colour changes. Now we measure the AgNO₃ again, now we know how much AgNO₃ we used.
We do this with each concentration of NaCl, and with the results we can calculate if there comes salt from a green bean during boiling.
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"Mathematics is a gigantic intellectual construction, very difficult, if not impossible, to view in its entirety." Armand Borel
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