Cation and Amnion Lab Essay

Next, I poured distilled water just below the 250ml mark on the neck of the volumetric flask.

In the lab we filled the first beaker up with water. Then we took a pipet (filled with the liquid) and dropped water droplets onto the

c) Record the amount of substance that dissolved – all, some, a little, or none.

solutions using qualitative analysis techniques. 1 Silver (Ag + ) and lead (Pb 2+ ) created a solution of

Introduction – A double replacement reaction is a chemical reaction between two compounds where the positive ion of one compound is exchanged with the positive ion of another compound. If you have the reactants of two reaction solution that you can determine the products. All you need to do is pair the positive parts of the compounds with the other compounds negative part. Once you find the products you can determine their phase of matter by using Table H. You can also use Table F to determine the solubility guidelines for aqueous solutions. If the product falls under soluble or exceptions to insoluble it is in the aqueous stare. If the product falls under

Heavy precipitate emerged immediately and solution turned white in color; solution then became opaque and turned light, bright blue in color.

B1. Work under the hood! Weigh out exactly 0.1 g of ammonium dichromate and add to a test tube. Clamp and warm gently with a Bunsen burner. Two of the products of this reaction are chromium(III)oxide and nitrogen gas. Watch for evidence of the third product.

The purpose of this experiment is to study ionic reactions, to be able to write balanced equations, and to be able to write net ionic equations for precipitation reactions.

To study the nature of ionic reactions, write balanced equations, and write net ionic equations for precipitation reactions.

When filling up the burette it is important that a funnel is used, however as the solution reaches the 0 mark it is ideal that the funnel be removed and a pipette used instead to reach the 0 mark, this is to achieve greater precision. During the experiment, it is important to swirl the flask continuously with one hand

Every reaction that occurred during this lab was a double replacement reaction, or a chemical reaction in which two aqueous compounds react with each other and result in two different compounds where one is either a solid precipitate, a liquid (water), or a gas. A precipitate in this case is a solid that exits the aqueous solution during the chemical reaction because it is too heavy to stay in the solution. Clear signs of a chemical reaction occurring is the formation of a precipitate, especially in a double replacement reaction, as well as the release of gas bubbles and the product of an acid. During a double replacement, the elements “switch partners” as seen with the base equation for all double replacement reactions, AB+CD→AC+BD. For a lab such as this, a hand lens could be used to confirm the presence of gas bubbles or a precipitate that would not have easily been seen without the device.

Dispense .5 mL water into the already weighed conical vial, replace cap and face insert on its down side.

precipitate; then pour over the solid in the funnel. Finally, pour two 10-mL portions of

Place a burette on the conical flask and then hold it by using a clamp stand.

At the end of the experiment when the lid was removed, it was found out that the blue colour of the copper (II) sulphate solution has faded away. It was turned to pale grey and there were some precipitates present. It was the zinc powder that was in excess to ensure that the copper (II) sulphate solution could react fully with the zinc powder.