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

Water Lab

Extracts from this document...


Water Lab - Trial I Aim To investigation the property of surface tension of water. Problem Statement What is the effect of increasing the number of pennies added to a completely filled beaker of water on the surface tension of the water? Hypothesis Materials 25 mL graduated cylinder (Uncertainty � 0.5 mL) 50 mL beakers (Uncertainty � 1 mL) Ruler (Uncertainty � 0.5 mm) Thirty pennies Marble Water Variables Manipulated Variable The volume of pennies added to beaker of water. Responding Variable Whether the water in the beaker overflows (surface tension is lost). Controlled Variables Volume of water in the beaker (The 50 mL beaker will always be filled to the brim so that the water level will be 1 mm over the brim of the beaker). The temperature of the lab (The temperature was kept at a constant 25�C). The volume of one penny (This value will be determined in the experiment). How the variables were controlled. Manipulated Variable The pennies were added one at a time in order to manipulate this variable at a constant rate; increasing the pennies one at a time made it easier to determine exactly how many pennies it took for the beaker to overflow. Controlled Variables [Volume of water in the beaker] The beaker was filled 1 mm above the brim every time to keep the volume of water in the beaker constant, thus allowing for the same strength of surface tension. ...read more.


50mL, water level is 1mm above beaker's brim 14 3 Slightly over 50mL, water level is 1mm above beaker's brim 15 Results from displacement experiment Volumes of Water, Five Pennies and Water, and Five Pennies in a Graduated Cylinder Volume of water in graduated cylinder (�0.5mL) Volume of five pennies and water in graduated cylinder (�0.5mL) Volume of five pennies in graduated cylinder (�1.0mL) 10 mL 12 mL 2 mL Finding the volume of 5 pennies was calculated Volume of 5 Pennies = Volume of 5 Pennies and Water - Volume of Water = 12 mL (�0.5mL) - 10 mL (�0.5mL) = 2 mL (�1.0mL) Finding the volume of 1 penny To find the volume of 1 penny, divide the volume of 5 pennies by 5. Data Processing To find the volume of pennies required to make the beaker overflow, multiply the volume of one penny by the number of pennies required to make the beaker overflow. Sample Calculation - Trial Processing the data into a table Volume of Pennies Required Causing a Beaker Filled With a Specific Amount of Water to Overflow Trial Volume of water in beaker (�1 mL) Volume of pennies required to make the beaker overflow (�0.2mL) 1 Slightly over 50mL, water level is 1mm above beaker's brim 5.2 mL 2 Slightly over 50mL, water level is 1mm above beaker's brim 5.6 mL 3 Slightly over 50mL, water level is 1mm above beaker's brim 6.0 mL Average of the number of pennies required to make the ...read more.


Although the pins were of the same brand and material, it is not certain that each pin was exactly 0.03g. This uncertainty could result in a change in the overall calculation of the mass. Under time constraints, we could not weigh the pins before putting them on the surface of the water. However, if there was more time allowed, we would have weighed each pin to make sure that each pin is the right mass. Also, while putting the pins on the surface of the water, they tend to move towards the edge of the petri dish, making it harder for the pins to be placed onto the water. As a result of this, some pins were stacked on top of each other, which could result in a concentrated amount of mass in one area of the petri dish that could break the surface tension. One way to improve this could be to find a larger container in which we could conduct the experiment. This way, we have more room to put the pins in, and they would not be accumulating in one specific place. In addition, the temperature of the room in which we conducted the experiment might not have stayed constant. Therefore, there may have been a change in the attractive forces of the molecules, causing a decrease or increase in the amount of weight the "skin" is able to hold. In future experiments, we could use a thermometer in order to monitor the temperature more sufficiently. ...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. Percentage of Water In Popcorn

    The data for delta fluctuated the most and was the least precise. According to my data, the delta kernels had the highest percentage of water and the beta kernels had the lowest percentage of water.

  2. The Drop of Water

    By determining volume from mass, one would be able to eliminate more of the possibilities for human error because a quantity determined by a scale available in our laboratory is a quantities measurement, correct to 0.005 or 0.0005 grams whereas measuring volume from a cylinder is a much less accurate method to measure quantity.

  1. Change of Potential Difference in Voltaic Cells Lab Report

    For 50ml of copper sulfate solution, divide the 1L mass by 20 = = 12.485g of CuSO4.5H2O Dissolve 12.485g of CuSO4.5H2O in 50 ml distilled water, using a volumetric flask. Use the formula: C1V1 = C2V2 to prepare different concentrations of copper sulfate from the stock solution of 1M concentration.

  2. Dissolved Oxygen in water

    Step 1: 2Mn2+ + O2 + 4OH- -->2MnO(OH)2 Step 2: MnO(OH)2 + 2I- + 4H- --> Mn2+ + I2 + 3H2O Step 3: I2 + 2S2O32- --> 2I- + S4O62- Variables: Independent variable: The independent variable in the experiment is the different water samples that we are taking i.e.

  1. Determining the water of crystalisation

    Data Collection and Analysis: Mass of crucible 29.58 � 0.05 g Mass of crucible and hydrated salt 31.56 � 0.05 g Mass of crucible and salt after first heating 30.85 � 0.05 g Mass of crucible and salt after second heating 30.84 � 0.05 g Table 2: Masses before the

  2. Chemistry lab reort-molar volume of hydrogen

    volume of hydrogen gas Percentage error 100% 1.34% Conclusion Two results of molar volume of hydrogen have percentage errors of 2% and 3%, respectively. These percentage errors are from the calculation of mole of hydrogen gas. The mole of hydrogen gas equals the mole of magnesium.

  1. The chemistry of atmospheric and water pollution.

    of haloalkanes up to eight carbon atoms. Isomers are compounds with same molecular formulas but different structural formulas. This is the nomenclature of naming haloalkanes: Use prefixes for the halogen groups (chloro, bromo, iodo, fluoro) If more than one type of halogen atom is present, name them in alphabetical order.

  2. Organic lab. Comparison of alkanes and alkenes

    This is the soot collecting on the basin. Therefore, a incomplete combustion occurred, in which the bi products of CO and carbon were released. Indeed, the soot is the amount of carbon produced by the combustion. Since the basin of the hexene was darker than that of the hexane, we can deduce that the combustion of hexene is more incomplete.

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