• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

How Concentration Affects the Rate of Reaction of Hydrochloric Acid and Magnesium Ribbons

Extracts from this document...

Introduction

How CONCENTRATION Affects The Rate of Reaction of Hydrochloric Acid and Magnesium Ribbons A chemical reaction is the process in which substances change into other substances. Chemical reactions can only take place when atoms, molecules, or ions collide with each other in order to share or exchange electrons. What happens in chemical reactions is that bonds are broken down, and new ones are made instead. To start a chemical reaction, reactants are needed in order to mix and chemically combine to give products. The rate at which the products are formed is called the rate of reaction. In this investigation, the reactants that will be used are magnesium and hydrochloric acid. The products I will result with will be magnesium chloride and hydrogen gas. The chemical reaction is shown in the following equation: Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen Mg(s) + 2HCl(aq) MgCl (aq) + H (g) Through these chemical equations nothing is revealed about the rate of reaction. However, what is shown through the equations is that a displacement reaction has occurred. Following the reactivity series, magnesium is shown as a more reactive chemical than hydrogen. Keeping this in mind, in a displacement reaction, "the more reactive metal will displace the less reactive metal from solutions of its compound". And so, this explains why magnesium displaces hydrogen, producing magnesium chloride and giving off hydrogen as a gas. We know as a fact that different chemical reactions take place at different rates. This is proven through usual daily life occurrences. The ripening of fruit is an example of very slow chemical reactions. Precipitation is an ideal example of very fast chemical reaction. ...read more.

Middle

9. Observe magnesium strip critically, once the strip disappears immediately stop stop-clock. 10. Record concentration of solution, and the result. 11. Repeat steps 1-10 for every concentration of the solution you have pointed out. * AFTER ONE SET OF RESULTS HAS BEEN COLLECTED, ANOTHER SET OF RESULTS FOR THE SAME CONCENTRATIONS MUST BE TAKEN. THIS WILL GIVE ME ACCURATE AND CONSISTANT RESULTS, WHICH I WILL BE ABLE TO RELY ON IN ORDER TO PUT TOGETHER A FINAL CONCLUSION TO THIS INVESTIGATION. Safety: Safety is an area where every person taking part in practical work should be cautious of, not only for their safety but the safety of others around them. In this particular experiment, hydrochloric acid will be used and all sorts of glassware, therefore I have to keep in mind that: * I use safety glasses; concentrated hydrochloric acid can irritate eyes. * Be careful with the use of hydrochloric acid, if any gets on skin, must be washed away immediately. Irritant. * I must be cautious of all the glassware I am using, breakable and can cut through skin. * I dispose all chemicals safely once I am done with using them. Preliminary Work: Concentration: Concentration Acid (cm�) Water (cm�) Time (mins) 5 95 more than 10 mins. 10 90 9: 10 100 0 0:15 I have found that the most reasonable range to take in my results is between the following concentrations (inclusive): 100 cm� of hydrochloric acid + 0 cm� of water 10 cm� of hydrochloric acid + 90 cm� of water Temperature: This variable must be decided on. Once we find the right temperature, we must maintain it throughout the experiment in order to conduct a fair test. ...read more.

Conclusion

3) When measuring the volume of acid and the volume of water, I could have been a bit inadequate due to the lack of time. Things may have been rushed towards the end of the experiment. There were some results that I was surprised with, and it was for the same concentration in both tests I carried out. The time for the reaction with 10cm� of hydrochloric acid and 90cm� of water seems completely out of range compared to the time for the reaction with 15cm� of hydrochloric acid and 85cm� of water. My results could have been more reliable if I had repeated the test a third time. However, the fact that I was running out of time did not help. Despite all this, I think the method of gaining the results was quite a good approach. The range of results were quite spread out, and gave me a large span to compare my prediction with. There were no exact patterns throughout the set of results I obtained. However, there was an obvious relationship, which is that as I increased the acid concentration the reaction time decreased. If I were set more time to investigate other aspects of the original question I would try to look for other relationships, or patterns. For instance, the part of my prediction, which says that, if you double the concentration of the acid, the rate of reaction would uniformly double. If I were given more time, I would investigate that bit of the predication specifically, and try to be more accurate to see if that prediction is true in any way. Or maybe if there is other patterns such as, if I double the concentration, the rate of reaction triples or quadruples. ?? ?? ?? ?? Chemistry Coursework RATES OF REACTIONS 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. Marked by a teacher

    Investigation of the rate of reaction between Magnesium and Hydrochloric acid

    4 star(s)

    250ml Conical Flask This conical Flask was need as this was the only type of conical flask in which the rubber cork of the gas syringe would actually fit in. Stopwatch Seeing as I will be measuring the volume of gas produced every 30 seconds (up to 240 seconds), a

  2. Marked by a teacher

    How dose temperature affect the rate of reaction between magnesium and hydrochloric acid.

    3 star(s)

    Prediction I think that the rate of reaction is going to increase as the temperature is going to be increased. There are some research I have done from the 'GCSE Double Science, Chemistry. The Revision guide, Higher Level, Third Edition- for 2000 and beyond.'

  1. Marked by a teacher

    For my experiment I am finding out the effects on the reaction rate when ...

    3 star(s)

    by using a measuring cylinder that is smaller but still can contain the amount of liquid we need we are increasing the level of accuracy to which the liquids have been measured therefore making our results that bit more reliable.

  2. How does changing the concentration of the Hydrochloric acid affect it reactions with Magnesium?

    Increases the average amount of energy particles have so more particles have the "activation energy" Both of these changes make the rate of reaction go up so we see a decrease in the amount of time taken for the reaction and an increase in time taken.

  1. Determine the rate equation for the reaction of hydrochloric acid with magnesium metal, and ...

    This also decreases the surface area for reaction on which the rate of reaction depends, so this causes an inaccuracy in my results. I would have been able to obtain a more accurate set of results if I could use magnesium powder with larger grains (greater volume:surface ratio and less affected by the experiment).

  2. Free essay

    Close Your Eyes

    She didn't have one. I looked up to see her eyes narrowing and looking at me. Oh shit she must have thought I was staring at her chest. Er no thanks. I turned back and saw Louise giggling out of the corner of my eye.

  1. How Concentration affects the rate of reaction.

    Particles in solutions have kinetic energy and they move around randomly in the space they are held in. Sometimes they collide with other particles of the same or different kind. When particles of different reactants collide they can bond to make new products and a reaction occurs.

  2. Investigating the Rate of Reaction Between Hydrochloric Acid (Hcl) and Magnesium (Mg).

    the conical flask is dry before putting any acid in as any water in the acid would lower the concentration. * Surface area: To keep this constant I must use the same strip of magnesium and keep it at the same length throughout the investigation.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work