• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3

# We can conclude that the experiment gave a reasonably accurate value for the number of moles of water of crystallization in oxalic acid

Extracts from this document...

Introduction

﻿Rimsha Arif IB1-5 Data Collection and Processing Qualitative Data: Once the sodium hydroxide solution was in the burette and a certain amount of oxalic acid solution was in the conical flask, along with three drops of phenolphthalein solution to act as an indicator, a few milliliters of the base was added to the acid each time. After every few milliliters, the conical flask would be swirled to ensure whether a color change has taken place or if it is still colorless. Soon, we begin to add a few drops of the NaOH solution into the conical flask and then we began to see a slight change in color. At first there were a few signs of color, but as a few more drops were added, the color became more prominent and showed a tinge of pink. This meant that the right amount of base was added into the acid and from using the results we are able to find the number of moles of water of crystallization in oxalic acid. ...read more.

Middle

value of the number of moles of water of crystallization in oxalic acid is given as 2 so the percentage error in the result is as follows: (1.72-2)2x 100%=14% We can conclude that the experiment gave a reasonably accurate value for the number of moles of water of crystallization in oxalic acid, since the percentage uncertainty is not considerably high and there isn?t a very significant difference between the calculated value and literature value of the number of moles of water of crystallization in oxalic acid. This shows that the experiment had systematic errors which caused this inaccurate value. Do the uncertainties in the apparatus account for this percentage error? No, if we take into account the uncertainty of +/- 2.49, the experimental relative atomic mass value ranges from 1.76 to 1.68. This range does not incorporate the true value of the number of moles of water of crystallization in oxalic acid, so we can see that there must be other random or systematic errors in the experiment. ...read more.

Conclusion

As we saw in the experiment, there were signs of the color pink in the flask but as we swirled the conical flask, the pink color disappeared, meaning we needed to add more sodium hydroxide solution. Repeating the experiment is another way to improve the accuracy. Due to time constraints we were only able to repeat the experiment three times, however we achieved very precise results therefore we can conclude that the experiment was quite accurate. However, improvements can be made by repeating the experiment about 5 times with the same variables and measurements and having more precise results with a difference of probably 0.05 cm³ than 0.1 cm³ as attained in the experiment. We can also consider the inaccuracies of the equipment used, for example the balance scale kept on giving a range of values for the mass of the weighing bottle, resulting in us choosing a value from that range. This causes an inaccuracy because the exact mass of oxalic acid crystals needed to make the solution may not have been used. ...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

# Related International Baccalaureate Chemistry essays

1. ## Disappearing cross experiment

and precise The two liquids were measured as precise as they could Spillage of the two liquids was avoided well Fig. 3 shows that the higher the temperature of the sodium thiosulphate is, the lower is the reaction time. Meaning that with increasing temperature the reaction time decreases.

2. ## Water of crystallization of BaCl2.xH2O

4. Put a clay triangle on the tripod. Keep the lid slightly open to make sure the water vapor can escape. Put the crucible on the clay triangle. Always use tongs to handle the crucible from this point onwards. 5. Leave the air hole half open in order to have a medium flame to heat the crucible for the first 5 minutes.

1. ## DETERMINATION OF WATER OF CRYSTALLIZATION

With the dish on the balance, put into it a specific amount of hydrated copper sulfate; make sure that the amount of hydrated copper sulfate is less than half full of the dish. Be sure the spatula is very clean to avoid contamination.

2. ## titration experiment

Observation: Base- pink Acid- transparent Neutral- transparent The color of solution, pink, got lighter and lighter as we added the acid. Part 1 and 2 both gave a sudden change, so we carried our experiment very carefully to pour acid drop by drop.

1. ## IB questions and answers on Atomic Theory

dropping to the first energy level, the Balmer series are due to electrons dropping to the second energy level. Which one of these series is U.V. and which is visible? Explain. The Lyman series refers to lines emitted in the UV region (electron transitions to level 1 are high energy transitions).

2. ## Reactivity of Metals with Water and Acid

There was no reaction when the copper was placed in the water, therefore no gas. Part B: Reactivity of Metals in Hydrochloric Acid Element Zinc Iron Aluminum Magnesium Physical properties Solid, shiny, silver in colour Rusty, small individual solid flakes, dull Powder, grey/silver Long, thin, solid, smooth, malleable, silver, shiny Reaction Slow reaction, but it eventually started to bubble.

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

H2 C OH HC OH H2 C O HC HO C R O O C R O O C R O Figure 3: Structures of glycerol, free fatty acid and triacylglycerol which the free fatty acid had binded. H2 C OH H2 C O C R glycerol fatty acid triacylglycerol

2. ## The chemistry of atmospheric and water pollution.

Decreases plant growth Affects aquatic organisms CFCs also contribute to the problem of the enhanced greenhouse effect. (The enhanced greenhouse effect is caused by gases, released by human activity, absorbing heat rays that come from the Earth's surface, and then emitting the heat rays.

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