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16 April, 11:25

A solution of hydrochloric acid is placed on a balance. Magnesium metal is added and the mass is recorded. The solution is stirred and the mass of the solution is recorded every 10 minutes. The following data is collected:

Time (mins) Mass of Hydrochloric Acid and Magnesium (g)

0 160.0 g

10 156.5 g

20 152.0 g

30 147.5 g

40 142.5 g

What does the data show is occurring?

The hydrochloric acid and magnesium metal react to form a soluble compound.

The hydrochloric acid and magnesium metal do not react.

The hydrochloric acid and magnesium metal react to form a precipitate.

The hydrochloric acid and magnesium metal react to form a gas.

+2
Answers (1)
  1. 16 April, 13:02
    0
    Remember conservation of mass. Mass can't just suddenly show up or disappear. It has to come from somewhere, and it has to go somewhere.

    The mass of this mixture/solution is decreasing as time goes on. That

    means that some mass is going somewhere, out of the dish and away

    off the scale.

    - - React to form a soluble compound?

    Maybe, but that doesn't take mass away

    - - They don't react?

    Maybe, but that doesn't take mass away

    - - React to form a precipitate?

    Maybe, so big deal. It sinks to the bottom. It doesn't take mass away.

    - - React to form a gas?

    If that happens, then the gas carries mass away!

    That must be it!
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