January 28 Chemistry 11

Copper Sulfate




Strontium Nitrate









Today in chemistry 11 we did a lab involving the stoichiometric method. We checked to see if the mass of precipitate matches with our prediction.

In this experiment we had to dissolve 2g of strontium nitrate in 50ml of water and then it would react with the left over copper (II) 3g of sulphate. once it reacted the product would be a precipitate. After we mixed the solutions the precipitate would be seperated by filtration, then we would have to leave it in the drying oven and weigh it when it is completely dried. We had to wait 1 day for all of the water to dry to make sure because just a drop of water could give us a huge amount of error in our percentage error.
After we had to calculate the number of moles of precipitate that were formed. We needed to make sure that none of the precipitate was left behind after pouring the mixture into the funnel. This also could give us a huge error towards our percentage error.


The balanced equation for this lab was:
Sr(NO3)2 + CuSO4 = SrSO4 + CU(NO3)2