• 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...

Introduction

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.

Middle

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.

Conclusion

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

    16.0 16.0 4.30 16.0 16.0 16.0 5.00 16.0 16.0 16.0 Time (mins) (� 0.03) Volume of hydrogen gas(ml) collected at 3M hydrochloric acid Trial 1 Trial 2 Average 0.00 0.0 0.0 0.0 0.30 8.0 9.0 8.5 1.00 10.0 11.0 10.5 1.30 16.0 17.0 16.5 2.00 18.0 19.0 18.5 2.30 18.0

  2. Enthalpy of Combustion Lab Report

    It is assumed that complete combustion of ethanol takes place. However the fact that when ethanol was being burnt in air, it burnt with a yellow flame and the black soot on the calorimeter indicated that carbon, one of the products of incomplete combustion was also formed.

  1. Aspirin Lab Report

    Continue adding base 5.0 mL past the equivalence point (the equivalence is approximately when the solution turned pink from the phenolphthalein).. 9. Repeat steps 1-11 for the remaining tablets. 10. Clean lab equipment with water, and wipe the lab surface with a wet paper towel.

  2. acid base lab report

    Phenolphthalein, the acid-base indicator that was used in this titration, has a color change range of pH range of 8.2 to 9.8 (see Table 1) and produced an endpoint colour change with Trial at a pH of 10.1. This indicator is unsuitable since it does not cover the range of the equivalence point which is 7.0.

  1. Combustion of alcohols lab report

    = 9908.48 Octanol: 159.54 x 4.18 x (39-22) = 11336.91 Nonanol: 159.67 x 4.18 x (31-20) = 7341.63 Molar mass of each alcohol (g) Ethanol Propanol Butanol Pentanol Hexanol Heptanol Octanol Nonanol Ethanol: C2H5OH (12x2)+6+16 = 46 Propanol: C3H7OH (12x3)+8+16 = 60 Butanol: C4H9OH (12x4)+10+16 = 74 Pentanol: C5H11OH (12x5)+12+16 = 88 Hexanol: C6H13OH (12x6)+14+16 = 102 Heptanol:

  2. Rate of reaction of Magnesium with Hydrochloric acid

    Time (sec) Trial 1 - Volume (cm3) Trial 2 - Volume (cm3) 10 50 55 20 70 84 30 71 87 40 71 88 50 71 88 60 -- 88 Sulphuric acid (1 mol dm-3) Time (sec) Trial 1 - Volume (cm3) Trial 2 - Volume (cm3)

  1. IB chemistry revision notes

    * pH is held constant o Adding alkali-->will combine with from the weak acid. * As are used up, more HA dissociates to restore equilibrium. * are mopped up. * Another example: * Preparing Buffer Solutions: o Acidic -->a weak acid and its salt, with a strong base.

  2. Investigating the Effects of Surface Area on the Rate of Reaction

    Another factor that played into my decision was the fact that the smallest calibration of the glass syringe I used was 5 cm3. Since the only visible measurements shown on the syringe were multiples of 5, it would only

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