The equation that we used for this lab was CuSO4*5H2O. We chose to do the lab with the blue crystals instead of the epsom salt lab. We first weighed four little blue crystals in a plastic tray boat and got that it weighed 4.07g. We then put the crystals in a test tube and heated the crystals over a bunsen burner and while heating them, the crystals started to turn white as the water started coming off of them. After letting them cool off for a while, we weighed the crystals again and got 3.66g. When the crystals were squirted with distilled water they turned back to blue.
The predicted weight that we got was about 10%. That was pretty different from the actual % we got which was 36%, because of the crystals that were stuck together and didn't get the water out of all the way. We subtracted the weight after heating from the weight before heating and that is how we got the 10% prediction. With the equation CuSO4*5H2O we multiplied the total CuSO4 mass by the 5 parts water. the total water mass is 90g, and the total mass was 249.6g. By dividing the 90g by the 249.6g, that is how we got the 36%.
No comments:
Post a Comment