• 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
4. 4
4

# Investigation into the dibasicty of sulphuric acid

Extracts from this document...

Introduction

OCR (2812/03/PLAN) Practical Examination 1 (Part A - Planning Exercise) Aim The aim is to prove that Sulphuric acid is a dibasic (diprotic) acid. Dibasic (diprotic) means that the acid in this instance H2SO4 contains two hydrogen atoms that can be ionized [http://www.thefreedictionary.com/dibasic] Experiments In order to prove its dibasicity I have to plan out two different methods, the first will include gas collection as the other will be a titration Hazard and safety precaution H2SO4 is very corrosive and can burn the skin therefore I shall wear gloves when handling the concentrated acid, also incase there is any spillage of the acid I shall clean it up with plenty of water or I shall use a weak alkali to neutralise the acid. Gas Collection The first experiment that I will be doing will be a gas collection I will be reacting magnesium with a monobasic acid (hydrochloric acid) and a dibasic acid (sulphuric acid), and will be measuring the amount of H2 gas being produced. To do this experiment I will need to use the apparatus shown in the picture below. ...read more.

Middle

To calculate the % error I must do the accuracy of the equipment over the mass of the Mg times 100 (0.01 � 0.070874) x 100 = 14% (This is an estimate) If I was using a more accurate method of weighing the mass using scales that had and accuracy of 0.001g I'd have a lower % error. (0.001 � 0.070874) x 100 = 1.4% (This is an estimate) I now need to calculate the minimum volume of H2SO4 required to produce 0.002916 moles of H2. Using the molar ratio of 1:1 I know I need 0.002916 moles of H2SO4. To work out the volume I will use the formula Volume = Moles � Concentration (The initial concentration of H2SO4 is 1moldm-3) 0.002916 � 1 = 0.002916 0.002916 x 1000 = 2.916cm3 For the actual experiment I will use 5cm3 of the H2SO4 to ensure there is excess acid to react with the Mg (0.07g). To prove that the H2SO4 is dibasic I am going to use the ionic equation which is 2H+ + 2e- --> H2 This is in consideration that I have collected approximately 70cm3 of H2 gas, I can show that I have collected 2 moles of H2 gas. ...read more.

Conclusion

Then silver nitrate solution is added. Various precipitates may be formed from the reaction between the silver and halide ions. To check that you have got bromoethane a very pale cream precipitate will have formed * Test for butan-1-ol To test for a primary alcohol you must oxidise the alcohol by heating with acidified aqueous potassium dichromate (VI), on gentle heating the primary alcohol will produce aldehydes . While the aldehyde is formed it must be separated by distillation as they are formed seeing as their more volatile than their corresponding alcohol. Upon stronger heating under reflux with an excess of acidified dichromate (VI), they aldehydes are oxidised to carboxylic acids. To see if you have a primary alcohol you would notice a distinct change to a very dark shade of brown/green. * Test for 2-methylpropan-2-ol To test for this secondary alcohol you would add a couple of drops of the alcohol into a test tube containing potassium dichromate (VI) solution acidified with dilute sulphuric acid. The tube would be warmed in a hot water bath. After heating over a sufficient period of time the tertiary alcohol should turn orange. ?? ?? ?? ?? WTFCOURSEWORKINGO Candidate Number: 5621 Centre Number: 12828 Page | 1 ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Organic 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 AS and A Level Organic Chemistry essays

1. ## Preparation of haloalkane. The purpose of this experiment is to prepare 2-chloro-2-methylpropane from ...

The reasons are: 1. The carbonium ion formed from 2-methylpropan-2-ol is a tertiary carbonium ion which increases its stability, so SN1 pathway is favoured. 2. As 2-methylpropan-2-ol is tertiary, there are 3 bulky CH3 groups blocking which caused steric hindrance.

2. ## The preparation of cyclohexene from cyclohexanol

Why the temperature of the still head should not exceed 90 degree in this experiment? As if the product received over 90 degree is the other product, like the water or acid vapours, not the cyclohexene. 5. What is the function of sodium chloride and anhydrous sodium sulphate in this experiment?

1. ## F336- aspirin individual Investigation

and extract the crystalline solid. Decision I have chosen to synthesise aspirin using method 2. I have chosen this method because: 1) It is less complicated that method 1 and involves measuring out less chemical so the chance of error (human and /or equipment)

2. ## The aim of this experiment is to produce Aspirin. This is an estrification in ...

Safety Precautions * Wear safety goggles * Melting point apparatus is hot while it is on. Take care otherwise it could burn you. * Capillary tubes break very easily, handle them with care. Results obtained were recorded in a table format:- Results Compound Melting temperature (c)

1. ## The aim of this experiment is to investigate the enthalpy change of combustion for ...

In the straight chain alcohol, butan-1-ol, the bond angle between the OH group and the neighbouring hydrogen atom is small at approximately 109.5 degrees as they are both bonded to the same carbon atom. This means that the hydrogen atom is readily available to react and this reaction requires little external energy to break the hydrogen bond.

2. ## investigating the amount of ascorbic acid present in fruit

Knife Used to cut up the fruit into small pieces. Distilled Water To help clean my equipment, furthermore if there are drops of acid left at the side of the beaker, I can use it to help me put the drops of acid in the ascorbic acid solution.

1. ## Comprehensive and Detailed Chemistry notes

Table and outline the relationship between position of elements in the Periodic Table and acidity/basicity of oxides -- Metals of Groups I and II all form basic oxides. The basicity increases down each group -- Most non-metals form acidic oxides.

2. ## Enzyme catalysed decomposition of hydrogen peroxide

Temperature: In this experiment, the temperature will be kept constant at 40 ?c (optimum temperature) using a water bath. This is because as temperature increases up to the optimum, the rate of enzyme activity also increases. In other word the substrate molecules gain more kinetic energy and the collisions

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