• 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. The purpose of this investigation is to determine the effect varying temperatures have on ...

    This decrease the amount of glycerin there actually is and made the measurement of the glycerin inaccurate. This decreased the distance of how much the marble travels through the glycerin from 50mL. By decreasing the distance, the time taken for marble to travel through the glycerin liquid also ends up decreasing which results in an in accurate measurement of time.

  2. Surface area vs Rate of Reaction

    Gas also takes time to travel through the tube, as the tube is bent and the gas was only pushed in 1 way. This problem can be very hard to solve, as the rubber tube has to be bent in order to get accurate readings of the gas, however, it

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

    * Presentation of processed data: Graph 2.1 shows the relationship between the concentration of sodium thiosulfate and the mean time taken for the cross to disappear. Graph 2.2 shows the relationship between the concentration of sodium thiosulfate and the mean time taken for the cross to disappear (excluding the concentration of 0.02 M).

  2. Rate of reaction of Magnesium with Hydrochloric acid

    Clean the conical flask and repeat with 50 cm3 of 2 mol dm-3 Hydrochloric acid. 6. Clean the conical flask and repeat with 50 cm3 of 1 mol dm-3 sulphuric acid. Results Hydrochloric acid (1 mol dm-3) Time (sec) Trial 1 - Volume (cm3) Trial 2 - Volume (cm3)

  1. Group 4

    altered slightly, this presents huge differences in physical engineering properties and behaviour. For instance, very small amounts of carbon (C) (between 0.2% and 2.1%) are added to iron (Fe) and act as hardening agents preventing dislocation of the iron atoms.

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

    tables and calculations 21 ASLAN Özge Cemre D129077 Appendix 1: Calculations for Neutralization of Numerous Times Fried Sunflower Oil Samples: Calculations for sample 1 (5 times frying) : Trial 1: V = 71.5 ± 0.1 ml → Vε = 71.5 ± 0.1% ml m = 5.433 ± 0.001 g →

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

    or MgO (in part Y) which leads to an increase in the specific heat capacity of the solution. Also inaccuracies in the process of standardization of HCl, if any, could have led to an understatement (or overstatement) of the specific heat capacity of the solution.

  2. Chemistry Titration Acid Base Lab

    An improvement for this component of the lab would have been to use a pH meter. A pH meter is a device that that measures the pH of a solution by determining the voltage of the solution by immersing two electrodes in it.

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