[M54B30]

Hi there,

Did two experiments last week, back to back.

The first was adding approx 0.15g magnesium metal to 50cm₃ of bench dilute HCl, recording the temperature every 30 seconds for 10 minutes.

The second was adding approx 2.0g of magnesium carbonate to 30cm₃ of dilute bench HCl, recording the temperature only at the beginning and end.

Now, one of the questions which related to the first experiment was asking why the concentration of the HCl was not important, and I believe it's because the magnesium metal is the limiting reagent and the HCl is in excess.

However, I'm a bit stumped on this question. It asks: Why was a smaller volume of HCl used in the second reaction?

You don't have to give me the answer straight off, I'd be more than happy to decipher clues! I really don't know where to start! I've completed all the enthalpy of formation calculations, it's just this I'm stuck on.

[cliverlong]

Please work out moles of magnesium and magnesium carbonate in both situations

Please write balanced chemical equations for the reactions

Please write the above two sentences on the rooms you occupy regularly