Plan
I am going to carry out this investigation by seeing how fast the magnesium strips dissolve in hydrochloric acid. To do this I will conduct an experiment, placing five magnesium strips in five different concentrations of acid. I will do this experiment twice to get more accurate results then I will compare the results with each other.
Equipment that I need
Measuring Cylinder Small Beaker
Thermometer Stop Clock
Hydrochloric acid Magnesium strips
Labelled diagram of equipment
How will you make your experiment safe?
To make my experiment safe I am going to were safety goggles to protect my eyes. I will also tuck my tie in to stop it dangling down and dipping in the acid and push my chair under the table to stop me from tripping.
How will you make your investigation a fair test?
I will make the investigation a fair test by using the same amount of hydrochloric acid and the same length of magnesium strip each time. I will also use the same beaker and have the same person dropping the magnesium strips in.
What will you change during your experiment?
The only thing I will change is the concentration of the acid, which I will change five times
What will you keep the same during the experiment?
During the experiment I will keep the temperature of each experiment the same. I will also keep the volume of the acid and the lengths of the magnesium strips the same.
Results
What did you find out in your experiment?
In my experiment I found out that the magnesium strips dissolve faster when the concentration of the acid is increased.
What does your graph show? What trends can you see?
From my graph you can see that doubling the concentration of the acid does not half the time that it takes the hydrochloric acid to dissolve the magnesium strips.
Evaluation
Describe any problems you had when carrying out your investigation
During my experiment I had no problems. Though, one problem would have been human error. For example stopping and starting the stopwatch could make the results seconds out
Did you obtain quality evidence? Do your repeat readings match the first set of results?
The information that I got from my results helped me see that but on reflection I could have done another experiment to gather more evidence. My second set of results was very much alike my first set of results as they are no more twenty seconds of and they get closer each time.
What changes could you have made to improve your experiment?
To improve my experiment I could have done three experiments, instead of two for a more wider range of results.
Are your results reliable enough to support your prediction?
My results were reliable enough to support my prediction. As the magnesium strips dissolved faster in the 2 molar than in the 0.5 molar acid.
What caused anomalies in your experiment?
I had no anomalies during my experiment as my results were quite accurate.
What detailed further work and experiments could you do to provide additional information?
To provide additional information could have repeated the experiment a couple of more times to get more accurate results then compared that with what I already have.
