Percent Composition and the Formula of a Hydrate Lab

Percent Composition and the Formula of a Hydrate Lab

Hayden Northwick

September 27th and September 30th

September 27th:

The Percent Sugar in Gum Activity - An Introduction to "Percent Composition"

     At the beginning of class Mrs. Friedmann gave each of us a piece of gum to chew on.  We then weighed the gum before chewing it and after having chewed it for a while.  Then using that information, we were able to calculate the mass of the sugar in the gum, the percent sugar out of total mass of the gum, the moles of sugar and the moles of gum, and find the ratio of gum particles to sugar particles.  Then applying the information to real compositions, we were able to find out the percent mass of each element in lead(II) sulfate.  We could do this by first finding the mass of the entire compound, then finding the mass of the individual parts of the compound and dividing that by the total mass to come up with a percentage of each part.

September 30th:

The Hydrates Lab

     We did the Hydrates lab today.  Sample results are:

Mass of the test tube:  21.62g

Mass of the hydrate and the test tube: 23.79g

Mass of the hydrate and the test tube after heating both: 22.95g

Sorry for not posting this yesterday...

The next person to post on the blog is:

 Colin Samuels