Cation and Amnion Lab Essay Example

the toolbar, select 1M of lead nitrate from the dropdown menu. Change the volume to 50mL. Make sure you have indicated that the lead nitrate is to be “placed in picked” 100 mL beaker. Click Ok. This should be added to the same 100ml beaker with the potassium chromate in it. Note: the volume increases to 100 mL. The solution becomes dotted, with a line at beaker bottom. This indicates a reaction occurred and precipitate has formed and settled on the bottom of the beaker. Set up the Erlenmeyer flask with a Buchner funnel.

Select equipment from toolbar, then from the dropdown menu, select Erlenmeyer flask—250mL. Right click the Erlenmeyer flask, choose Buchner funnel. The Buchner funnel will be added to your Erlenmeyer flask. Select the 100mL beaker and right click on Pour/Decant. The flask will turn on its side so that you can move the beaker above the Buchner funnel. The solution will pour into the funnel when positioned correctly. Note: When the solution has been filtered, a white area will appear on the bottom of the flask. Right click the flask. Select Buchner funnel.

Message window appears with question. Select place solid into 50mL Test tube. Click OK. Note: a test tube will appear with a small amount of precipitate on the bottom. To measure the weight of the precipitate, right click the test tube. Select show weight. The weight of the precipitate will appear below the test tube. Record this information in the Observations and Results section of the lab report, including the weight and appearance of the precipitate.

Observations and Results

The appearance of the precipitate

was shown several ways during the experiment. In the 100mL beaker, after both chemicals were added, it was shown as a dotted solution. It was then shown as a solid and a white color in the Erlenmeyer flask; however when it was placed in the test tube the color of the precipitate was yellow. The yellow color indicated that there was indeed a reaction that occurred. The filtered precipitate weighed 16. 160g.

Discussion

In this experiment, for the ionic compound lead (II) nitrate, the anion was the nitrate and the cation was the lead. For the ionic compound potassium chromate, the anion was the chromate and the cation was the potassium.

Lead and potassium has a positive charge and are only able to react with a molecule that is negatively charged. So, lead can only can only react to the chromate in this instance and potassium can only react with the anion, nitrate. The anion and cations switch and replace each other to form lead chromate and potassium nitrate.

Conclusion

In conclusion, when you mix two ionic compounds together that are soluble in water, specifically lead nitrate and potassium chromate, it creates a double–replacement reaction and results in a precipitate being formed. I found that the product of the precipitate weighed 16. 160g.