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

Rates of Reaction Lab Report - magnesium and hydrochloric acid

Extracts from this document...


RATES OF REACTION LAB REPORT(c) AIM: Answer the Research Question (RQ)! RQ: What is the correlation between chewing and digestion? BACKGROUND INFORMATION: Chewing is an extremely important, yet oftentimes overlooked, part of healthy digestion. Most people put food in their mouth, chew a few times and swallow their food, as if their sole focus was how quickly they could get their foods to their stomachs. The action of chewing mechanically breaks down very large aggregates of food molecules into smaller particles. This results in the food having increased surface area, an important contributing factor to good digestion. HYPOTHESIS: The longer the chewing period and intensity, the larger the resultant surface area, which should result in a faster rate of reaction. INDEPENDENT VARIABLE: Reactant surface area (mm2) DEPENDENT VARIABLE: Time (sec) CONTROLLED VARIABLES: HOW it was controlled: 1. Reactant Magnesium was used throughout the experiment. 2. Acid HCL was used throughout the experiment. 3. Molarity of HCL acid {M} A molarity of 1 was used throughout the experiment. 4. Pressure (on the hydrogen bubble) {Pa} vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv a. ...read more.


5. Place 1 strip in the cylinder, start the stopwatch, clamp your thumb (or finger) over the top of the cylinder, invert the cylinder then submerge it in the acid in the large beaker, then release your thumb (finger). It is imperative all these steps are done at light speed. 6. Stop the stopwatch once the hydrogen air bubble reaches 6 mL. 7. Repeat steps 5 and 6 changing only the number of magnesium strips, essentially adding one more each time. 8. Repeat step 7 as many times as possible until consistent results are obtained. DATA COLLECTION: 1 Strip: Trail 1 2 3 4 5 Time (s) �0.36% 27.46 27.46 27.46 27.46 27.46 2 Strips: Trail 1 2 3 4 5 Time (s) �1.00% 10.03 10.03 10.03 10.03 10.03 3 Strips: Trail 1 2 3 4 5 Time (s) �1.60% 6.25 6.25 6.25 6.25 6.25 4 Strips: Trail 1 2 3 4 5 Time (s) �1.78% 5.63 5.63 5.63 5.63 5.63 5 Strips: Trail 1 2 3 4 5 Time (s) �1.98% 5.06 5.06 5.06 5.06 5.06 Strip Dimensions: Ruler uncertainty: �0.5 mm Thickness: 0.5 mm �100.0% Width: 3.0 mm �16.7% Length: 10.0 mm �5.0% DATA PROCESSING: Total Surface Area (SA) ...read more.


So technically, a measurement of 0.5mm with a ruler, whose smallest graduation is 1mm, will lead to 100% uncertainty; however, in reality, I doubt it that the uncertainty is actually that large; which is why this issue is only a weakness, and not a limitation. Therefore, the conclusion and data are accurate and reliable, because the trend is clear. Another weakness is the method. In terms of safety, it's generally unsafe to go about placing one's hand in acid; even if the acid is really weak at 1 M. Also, the method was tedious and was rather manual and primitive, specifically the part where the chemist is required to clamp their thumb (finger) over the cylinder's top. IMPROVEMENTS: The most important improvement is to use a more accurate measurement device to measure the dimensions of the magnesium strips, particularly the thickness. Or using a different reactant that provides for a better shape, for a more accurate dimension measurement. Addressing the second weakness concerning the method; using a gas syringe would've been more efficient, and less tedious, not to mention safer. ?? ?? ?? ?? Al-Ghraoui(tm) Page 7 of 7 Tammam Al-Ghraoui Chemistry SL Mr. Barrett Sunday, June 13th, 2010. Page 1 of 1 Al-Ghraoui (tm) ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry 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 International Baccalaureate Chemistry essays

  1. Rates of Reaction Lab

    (� 0.03) Volume of hydrogen gas(ml) collected at 1M hydrochloric acid Trial 1 Trial 2 Average 0.00 0.0 0.0 0.0 0.30 0.0 0.0 0.0 1.00 0.0 0.0 0.0 1.30 0.0 0.0 0.0 2.00 0.0 2.0 1.0 2.30 1.0 3.0 2.0 3.00 3.0 3.0 3.0 3.30 3.0 4.0 3.5 4.00 4.0 4.0 4.0 4.30 4.0 4.0 4.0 5.00 4.0 4.0 4.0 Time (mins)

  2. Aspirin Lab Report

    The pH probe should be rinsed with DI water, gently blotted dry, and put back into its storage solution. Place a 325 mg aspirin tablet in about 20 mL of deionized water and let stand for a few minutes. The tablet will break apart as it absorbs water and swells.

  1. The rate of reaction between sodium thiosulfate and hydrochloric acid

    given volume increases, the number of collisions between the reactant particles (sodium thiosulfate and hydrochloric acid) will increase, therefore the rate increases. * Evaluation of procedures: * Strengths: * Safety in the laboratory is highly maintained (by wearing goggles, lab coat and being careful with glass apparatus to avoid any chemicals that may splash).

  2. Acids/Bases Design Lab. How does a change in the pH value of a solution ...

    (Recall: do as you otter, add acid to water!) 4. A clean, dry, 50.0cm3 graduated cylinder was filled with approximately 10.0cm3 of distilled water. The 7.0cm3 of hydrochloric acid solution in the 10.0cm3 graduated cylinder, was then added to the 50.0cm3 graduated cylinder containing approximately 10.0cm3 of distilled water. 5.

  1. Indicator Lab Report - investigating acid-base reactions

    Strong Acid + Strong Base: HCl + NaOH = NaCl + H2O Strong Acid + Weak Base: NH3 + H2O - NH4+ + OH- HCl + OH- = H2O + Cl- Weak Acid + Strong Base: CH3COOH + H2O - CH3COO- + H+ H+ + NaOH = H2O + Na-

  2. Moles of Hydrogen report

    Use the combined gas law to calculate the volume the hydrogen would occupy under STP conditions. Length of Magnesium Used- 2cm (P1 x V1)/T1 = (P2 x V2)/T2 P1= 102.5kPa P2= 101.3kPa V1= 36cm3 V2= X T1= 291.1K T2= 273K (102.5 x 36)

  1. Measuring the fatty acid percentage of the reused sunflower oil after numerous times of ...

    Last limiting factor was the preparation of the alcoholic KOH solution and the 0.5% phenolphthalein solution which contains 95% alcohol. As to get the preferred concentration of KOH and the exact percentage of alcohol in the phenolphthalein, the solution has to be prepared by the lab assistant.

  2. To determine the standard enthalpy of formation of Magnesium Oxide using Hess Law.

    Enthalpy of reaction calculated for this trial = * ?HX (Trial 1) = = 249000J = -249kJ.mol-1. For Part X, Trial 2 Graphical analysis similar to that used in Part X, Trial 1 has been used to determine the maximum temperature reached in the duration of the reaction.

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