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I want to find out how the concentration of Hydrochloric acid affects
the amount of hydrogen or the time it takes to produce 30cm3 of gas,
when the Hydrochloric acid reacts with the magnesium powder.
I predict that the amount of hydrogen in the measuring cylinder will
increase as the concentration increases; this is because if there is
more concentration there shall be more particles for the magnesium to
collide with so the reaction will be faster. I think that my
prediction is true because if you increase the concentration there are
more particles in the test tube so there is more likely to be a
collision and when a collision happens there is a reaction and
hydrogen is produced. I plan to take 5 readings and repeat one more
time to be able get an average. I predict the time it takes the
hydrogen to reach 30cm3 will range from 5s to 25s. I think that the
reaction will happen like this Magnesium +Hydrochloric acid>
Magnesium Chloride + Hydrogen
Mg(s) + 2HCL(aq)> Mgcl2(aq) + H2(g)
[IMAGE] Measuring cylinder
[IMAGE][IMAGE][IMAGE][IMAGE] Test tube Hydrogen Pipe
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"The Effect of the Concentration of Hydrochloric Acid on the Amount of Hydrogen." 123HelpMe.com. 18 Jun 2019
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Tub with Water
To keep this a fair test the things I am keeping the same are, the
amount of magnesium powder, the same amount of liquid in the test tube
before I put the magnesium powder in, the same amount of gas I am
going to measure, the same bung, the same clock, the same measuring
cylinder and the same tub. The variable I am going to change is the
Hydrochloric acid to water ratio. I have to make sure that I use the
same mass of magnesium, this is because it will make it a fair test
and the results will be related to each other, otherwise the results
will be completely different to what I expect and it will be, and it
will ruin the experiment.
1. Get all items- Test tube, magnesium powder, hydrochloric acid, tub
filled with water, bung, clock, measuring cylinder and pipe.
2. Fill the measuring cylinder with water and place over tub making
sure that there no gas in measuring cylinder. Put 5cm of hydrochloric
acid in test tube.
3. Put one end of the pipe in the tub and the other end over the side
of the test tube. Put the bung on immediately after the 0.10g of
magnesium powder is put in.
4. Measure the amount of time that it tares till the hydrogen reaches
30cm3 and record it in the table.
5. Repeat experiment with 4cm Hydrochloric Acid and 1cm Water, 3cm
Hydrochloric Acid and 2cm Water, 2cm Hydrochloric Acid and 3cm Water
and 1cm Hydrochloric Acid and 4cm Water.
Amount of Time to produce 30 cm3 of Hydrogen
I would say that my results are of good quality and are quite
accurate. The pattern found in the results was that the higher the
amount concentration the faster the hydrogen reaches the point and
this proves my prediction. In my results there was an anomalous point
which was because I did not put the bung on quickly enough so it took
longer time for the gas to reach 30cm3.
I would say that my results are pretty reliable and of good quality
because I have taken 2 sets of results and averaged them to make the
I could improve my results by making sure that I put the bung on at
the right exact moment so I get the right results. I think that the
lat result was too high because I might have accidentally put more
magnesium or more hydrochloric acid.