• 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

# To determine the concentration of a lime water solution

Extracts from this document...

Introduction

Skill P: Planning Greig Rawlings To determine the concentration of a lime water solution Definition * My task is to plan an experiment to find the accurate concentration of the limewater solution which is roughly 1gdm-3. * To do this I am going to do a titration using hydrochloric acid which I will need to dilute * I am provided with 250cm3 of limewater, 2.00mldm-3 of Hydrochloric acid and an indicator * I hypothesise that if I double the concentration of acid then the amount required to neutralise the calcium hydroxide will decrease by two because it is well know that if you double the concentration of something you will only need half the amount to have the same effect. Application * There is a standard equation for a reaction of a metal hydroxide and hydrochloric acid: M(OH)2 + 2HCL MCl2 + 2H20 (M = metal) ...read more.

Middle

/ 50cm3 = concentration = 0.1 moldm-3 Mr of Calcium hydroxide = 74 gdm-3 = 74 x 0.1 = 7.4 gdm-3 * I will use methyl orange indicator because the limewater is a weak base so methyl orange has an endpoint of 5 - 8 on the pH scale where as phenolphthalein indicator has a much higher end point this means that the end point would be reached before the equivalence. Variable Control * You need t ensure that you take your chemicals from the same batch so as not to get two different concentrations each time you test them. * Temperature and pressure should have no effect on the reaction Organisation 1. Set up the equipment as shown in the diagram below, ensuring that the burette valve is closed. 2. Run de-ionised water through the burette and wash all of the equipment with it 3. ...read more.

Conclusion

* 500cm3 Volumetric Flask * 250cm3 Conical Flask * Burette * White tile * Clamp and Stand * In addition to this you will need: * 250ml of Calcium Hydroxide solution * 25ml of 2.00mol Hydrochloric acid * De-ionised Water * Indicator (methyl orange) * Apparatus set up: Risk Assessment * Hydrochloric acid is corrosive and so it is necessary to wear goggles, lab coats and gloves * Calcium hydroxide can also be dangerous to the eyes so again safety goggles are important * Also care needs to be taken when diluting the hydrochloric acid as they react violently so the acid should always be added to the water slowly and not the other way around. * If any chemical comes into contact with the eyes then they need to be washed using an eyewash. With the low strengths in this experiment medical attention does not necessarily need to be immediately sought unless serious. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Aqueous 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 GCSE Aqueous Chemistry essays

1. ## Chemistry concentration of lime water.

So if I were to use the phenolphthalein indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up). Implementing Safety is very important and it is necessary to follow safety procedures.

2. ## Determination of the concentration of lime water solution

Using a pipette to measure the acid ensures accurate results, as a pipette ensures a high degree of precision. Transferring the acid then into a volumetric flask also contributes to the reliability of my results as a volumetric flask has a mark that measures to 250cm3, this allowed me to accurately fill the flask up to the 250cm3 with water.

1. ## Investigation to determine the effect of different sugar concentrations on Benedict's solution.

The thermometer will be required to measure the temperature and also make sure that the same temperature is used for all solutions. The distilled water will be used along with the Glucose to make a 10% sugar solution, which will be discussed in the method.

2. ## Determining the concentration of lime water

* Next I will measure some Calcium Hydroxide which will already have been prepared to the right concentration, by the volumetric pipette (25.0 cm�) after rinsing the volumetric pipette with Calcium hydroxide and add it to the conical flask. * I will then add the diluted Nitric acid to the

1. ## To determine the concentration of lime water

In making my choice of indicator I also had to be very careful. The Limewater used will be a relatively weak base so it will be appropriate to use methyl orange as it has an end point on the ph scale between 8-5.

2. ## Determine the concentration of lime water.

After this it the results must be noted in a table as I have indicated in the table below. Titration 1 Titration 2 Titration 3 Final Reading 6.70 cm3 12.30 cm3 17.90 cm3 Initial Reading 1.00 cm3 6.70 cm3 12.30 cm3 Titre 5.70 cm3 5.60 cm3 5.60 cm3 Average titre

1. ## To determine the concentration of Limewater solution

I will also keep other variables such as temperature the same as a higher temperature will give the molecules more heat energy which will cause a faster reaction giving an unfair result. I will keep all the variables constant by leaving the chemicals to reach room temperature and to ensure that I measure the amounts of substances extremely carefully.

2. ## Chemistry concentration of lime water.

So if I were to use the phenolphthalein indicator then the end point (colour change) would be reached before the equivalence point (when the chemicals, acid-base break up). Implementing Safety is very important and it is necessary to follow safety procedures.

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