Cation and Amnion Lab Essay

Next clamp the vacuum flask securely to a clamp and stand, attaching the Buchner funnel to the top with the use of a rubber funnel

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

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

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.

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

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

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.

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.

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

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

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

5. Wet the paper with distilled water to hold it in place in the funnel. Transfer all the solution and the precipitate from the beaker using a rubber policeman. Wash the precipitate with two or three 5-mL portions of distilled water. Do this by adding each portion to the beaker in which you did the precipitation to transfer any remaining

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.

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