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

Investigating the effects of Sodium Hydroxide concentration on Catalase

Extracts from this document...


Investigating the effects of Sodium Hydroxide concentration on Catalase I will be investigating the effects of Sodium Hydroxide (NaOH) concentration on catalase, which is an enzyme. This would be done by use sheep liver as it contains catalase, and mixing it with different concentration of Sodium Hydroxide which is an alkaline, and then adding 10% of Hydrogen Peroxide to get the reaction going as catalase promotes the conversion of hydrogen peroxide. This is because catalase has a pH of 7 normally and where Sodium Hydroxide is an alkaline over time it will lose hydrogen ions to the solution and therefore decreases enzyme active. This investigation is to test the rate of reaction of catalase and Hydrogen Peroxide under different alkaline concentration of Sodium Hydroxide condition. Therefore I predict that as you increase the concentration of Sodium Hydroxide you will decrease the enzyme active, as this is because catalase in a alkaline solution loses hydrogen ions, which changes the produced of the chemical bonds of the enzyme molecule causing a change in the shape of the enzyme, cause the active of it to decrease, or in other words you denature the enzyme. This is likely to happen in the higher concentration of sodium hydroxide, where in the lower concentration due to it being less alkaline, more to the pH of catalase the lose of it hydrogen ions will be less or slower cause a increase in the rate of reaction. Therefore I also predict that my graph will look like this, having a fast reaction at the start but then slowing down till it stops. The apparatus that I would need to carry out this investigation would be, Gas syringe, Sheep Liver, Sodium Hydroxide (NaOH), Hydroxide Peroxide (2H2O2), Camp stand, Stop watch, Mortar and pestle, Conical flask, Tile, Scalpel, Scales, Distilled Water, Measuring tube and A bit of sand I believe that using these apparatus will give me the most relevant and relievable results to prove my prediction right. ...read more.


This would be down to the fact that catalase is an enzyme and will have it activity rate effect at different pH levels, as Sodium Hydroxide is an alkaline so the higher the concentration the more off a stronger alkaline it is, which in turn denature the enzyme meaning that it shape has changed and can no longer react with the substrate as it can no longer fit in the enzyme and therefore the quicker this happens the lower the rate of relation with be. Pattern that I have found in my graph is that they all seem to look like this This can be easily described why this has happened, but putting the graph into three sections A, B and C like so: Section A is the start of the reaction when you first add the liver to the Sodium Hydroxide then adding the Hydroxide Peroxide, the reaction is quick here no matter at what concentration the Sodium Hydroxide as the enzymes are reacting with the substrate faster then it can break then down, this part of the reaction can also be linked to the collision theory because of the fact that the reaction is only happening, and gas is being released because of the enzymes are colliding with the substrate, but as soon as all the enzymes have become denature the substrate can no longer fit into the enzyme so they can no longer react. However section A is the fastest bit of the reaction as a lot gas is being produced in a small amount of time. Section B is the part of the reaction where there are a few enzyme that have not be denature yet or there is only a few substrates to react with so the reaction slows down, though the reaction its happening it is at a much slower rate then before in section A, and this down to two thing, one being that only a few enzymes have not been denature and therefore the gas produce ...read more.


the enzymes.Could also use different materials that will react with catalase to see if that has any effect at all, you could use different tissues or different chemicals for this, like more and different alkaline as this is what I use in my investigation, as you could use different alkaline to see if they have a different effect or the some on catalase, as this will give a better sign to what the effects of different alkaline concentration have on catalase. I could also use more liver, use more then a gram of it to see what effect that has, which is likely to increase the amount of gas being produced, same as if I would to increase the amount of Sodium hydroxide and Hydroxide Peroxide would likely increase the gas produced or could have the opposite effect and decrease the amount of gas produced, as there is more of the alkaline substance and therefore it will be quicker at denaturing the enzymes and there will be less gas produced because the enzymes can no longer react with the substrate, as Sodium Hydroxide being an alkaline and catalase being a enzyme, over time, quicker in higher concentration of Sodium Hydroxide, catalyse will lose its hydrogen ions which changes the produced of the chemical bonds of the enzyme molecule causing a change in the shape of the enzyme or know as denaturing the enzyme, so the substrate can no longer fit into the enzyme and therefore can no longer react with it. Therefore I believe my investigation well apart from one set of result other then that, it went well, the experiment proved my prediction that as you increase the concentration of Sodium Hydroxide you decrease the amount of gas produced from the reaction, so therefore I believe that my results are good enough and relievable to prove it right and to show what happened in my investigation, so over all the investigation went well and my prediction was prove right. Paul Robinson Biology Coursework ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment 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 AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Fighter Pilot A Statistical Analysis of Reaction time and its Correlation with Dominant ...

    5 star(s)

    person can respond faster to what's happening and allowing the flow of information along the visual and motor nerve pathways. (23) The hemispheres of the cerebrum are specialized for different tasks, the left hemisphere is regarded as the verbal and logical brain, and the right hemisphere is thought to govern creativity, spatial relations, face recognition and emotions.

  2. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    The combined effects of solute concentration and physical pressure are incorporated into a measurement that is called Water Potential. Water potential determines the direction of movement of water, so water moves from a region of higher water potential to regions of lower potential.

  1. Marked by a teacher

    'An investigation into the ability of two strains of the yeast Saccharomyces cerevisiae to ...

    4 star(s)

    showed a mean of 5.73cm3 of 0.1 mol dm-3 NaOH, was required to neutralise the carbonic acid produced as a result of the yeast's cellular respiration. This may appear curious considering that no carbon source was present as a respiration substrate.

  2. the effect of bile concentration on the activity of the enzyme lipase during the ...

    enzyme lipase as a biological catalyst which speed the rate of reaction. During chemical digestion the "detergent action of bile salts, particularly lecithin is required to disperse the fat into small globules for efficient lipase digestion" as pancreatic lipase is a water soluble enzyme and can therefore only act on the surface of fat globules.

  1. An investigation into the distribution of adult and juvenile limpets on a rocky shoreline.

    mean of adult limpet is 230/30= 7.7 The data will be represented in a bar chart : A normal distribution is expected to be obtained, limpets are most abundant in the middle of their vertical range, where conditions are thought to be optimum.

  2. out how different concentrations of the enzyme pectinase affect the degradation of the substrate ...

    An increased rate of reaction would result in more pectin being catalysed in a given time, so leading to an increased rate of juice flow. Although highly unlikely in this experiment, significant increases in temperature would cause the atoms within the pectinase molecules to vibrate.

  1. Investigating the effects of different lead chloride concentrations on the growth of cress seedlings

    The main toxic effect of high concentrations of lead on a plant is the effect on plant growth. Lead will stop plant growth because lead acts as a non-competitive irreversible enzyme inhibitor. Enzymes are required for many metabolic reactions such as respiration and photosynthesis.

  2. To investigate how concentration of the enzyme catalase in celery extract affects the rate ...

    It becomes denatured, and cannot hold the substrate molecule. Material from - http://s-cool.co.uk Temperature is a key factor too. If it is cold there will be little or no kinetic energy and so the enzyme molecules will move around too slowly to meet the substrate molecules, so the reaction rate is slowed.

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