[jbpoon]

My hypothesis was : If the time of reaction increases or decreases, the mass of CuCO3(s) should stay constant.

My conclusion so far: The data in figure 1 shows a slight inverse relationship between the mass of CuCO3 and time. Furthermore, because of the inverse relationship, the hypothesis is proven incorrect. However, the results are slightly inconsistent due to it being an experimental data.


My teacher's criteria: Gives a valid conclusion based on the correct interpretation of the results as supported/explained by specific evidence and an explanation  and compares results with prediction.

My interpretation are based of this graph(evidence) of the experiment that i conducted. Now my teacher is also asking for explanation.. i don't know how to explain it... please help.

[Dan]

You will have to tell us what the experiment is, we're not psychic.

[jbpoon]

You will have to tell us what the experiment is, we're not psychic.

The lab is about "Factors that affect the mass of a Precipitate".

I chose the factor to be "Time".

so i did 4 trials which are shown on the graph.(0s, 30s, 60s, and 90s).

Basically i would wait x amount of time before filtering the solution.
The solution was made from: CuSO4 (aq) + Na2CO3 (aq)  CuCO3(s) + Na2SO4 (aq)

The filtering was done by putting the filter paper inside a funnel and pouring the solution down the funnel. The filter paper would collect the precipitate.

After waiting for 48 hours for the precipitate on the filter paper to dry we would weigh it.(we weighed the filter paper before begining the lab).

we would calculate the mass of the precipitate by this formula:
Filter Paper and Precipitate - Filter Paper = Precipitate.

Now I'm doing the conclusion which i'm stuck on
no clue what to talk about or how to explain it
btw: nice necronomicon avi