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

To determine the concentration of a limewater solution

Extracts from this document...

Introduction

AS - Assessed Practical (Skills P and A) To determine the concentration of a limewater solution A balanced equation of the reaction: Ca(OH)2(aq) + 2HCl (aq) CaCl2(s) + 2H2O(l) The aim of my experiment is to determine the concentration of a limewater solution which contains approximately 1g dm-3 of calcium hydroxide by using hydrochloric acid as a reagent in a titration. Safety Procedures The following safety procedures should be notified first to ensure the safety of the person carrying out the experiment. Normal lab rules should apply throughout the experiment; goggles and lab coats should be worn to protect eyes and clothing. Hydrochloric acid can cause serious permanent damage if it comes into contact with the eyes or skin. Dilute solutions are mildly corrosive and toxic if inhaled; the experiment should be carried out in a well ventilated and well lit room. Gloves may be worn to protect skin when handling the acid. ...read more.

Middle

If it was left with its same concentration, the indicator would change colour too rapidly to control or see. 1gmol-3 can be converted into moles using the equation: Amount (moles) = Mass (g) = 1 _ = approximately 1_ = 0.01 mol dm-3 Molar Mass 74.1 100 The molar ratio of the equation is a 1:2 ratio between calcium hydroxide and hydrochloric acid, therefore two moles of acid react with the limewater. This means that the molar value for the calcium carbonate must be doubled to fit the molar ratio for the molar value of the hydrochloric acid: Amount (moles) = Mass (g) = 2 _ = approximately 2_ = 0.02 mol dm-3 Molar Mass 74.1 100 The acid should be diluted to the same amount to increase accuracy of results; therefore I plan to dilute the hydrochloric acid with concentration of 2.00 mol dm-3 by a dilution factor of 100 to 0.02 mol dm-3 The equipment I plan to use to dilute the acid is a 250ml volumetric flask ...read more.

Conclusion

Measure out 25ml of calcium hydroxide into a conical flask using a 25ml pipette by squeezing the pipette pump until the solution is past the 25ml line and then removing the pump to lower the meniscus exactly onto the line, (see Fig.2.). Add a few drops of phenolphthalein; the colour of the solution should turn pink or fuchsia coloured which will indicate a solution of high pH value. The indicator will turn colourless below pH 8 when the limewater has become fully neutralised by the hydrochloric acid. To begin the titration, set up the equipment as shown in fig.1. Fill the burette with the diluted hydrochloric acid using a funnel which must be removed at the start of the titration as it will decrease accuracy of results by increasing the volume of the acid in the burette. Place the conical flask of calcium hydroxide under the burette and on top of the white tile so that the colour change of the phenolphthalein is more evident to see. Resources Used: http://www.btinternet.com/~chemistry.diagrams/titration.htm ?? ?? ?? ?? ...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 Inorganic 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 AS and A Level Inorganic Chemistry essays

  1. Peer reviewed

    Determining the concentration of acid in a given solution

    5 star(s)

    I will use a volumetric flask to measure up the amount of sodium hydroxide solution needed. There are volumetric flasks of 100cm3 and 250cm3. I will use the 250cm3 flask as this will provide me with enough solution to do all my titres and will minimise the percentage error as the volume it carries is larger.

  2. Peer reviewed

    Deducing the quantity of acid in a solution

    5 star(s)

    To prevent any harmful contact with sulphuric acid, methyl orange and sodium carbonate, we are going to use gloves and safety glasses. Also, we will ensure there is always suitable ventilation in the room and no flames around. Also, given that we are using glass ware, we need to know what to do if it is broken.

  1. Peer reviewed

    Investigation to determine the Relative atomic mass of Li

    5 star(s)

    100cm3 measuring cylinder 0.500 Balance 4.170 25cm3 pipette 0.012 50cm3 burette 0.120 Total 4.802% Thus the actual result with quantitative errors taken into account can be calculated. - 4.802% of calculated mass of Li = 7.21/100 x 4.802% = 0.346 - actual result is 7.21�0.346 - this is between 6.86

  2. effects Concentration and Temperature on the Rate of Reaction

    form of the equation. Log to the base e is denoted by ln: ln k = In A - Ea RT This can be further rearranged to give: ln k = -Ea x 1 + ln A R T If a graph of In k against 1/T is drawn, it

  1. Bleaching experiment. Estimation of available chlorine in commercial bleaching solution.

    After the addition of starch, the mixture turns deep blue. Hence if the end point was only detected by the color of iodine in iodide (the change in color 'brown-->yellow-->colorless', there would be a large percentage error, provided that this kind of end point is very difficult to observe.

  2. Finding Out how much Acid there is in a Solution

    eye: flood eye with water for at least 10 minutes, seek medical advice * Water (H2O) o No risk with small volumes produced in this investigation * Carbon Dioxide (CO2) o No risk with small volumes produced in this investigation Method - Making up Sodium Carbonate Solution This is an

  1. Scientific Practical Techniques

    Result of the experiment presented in table Sample 1 Square Number of cells 1 6 2 4 3 10 4 10 5 19 Total 49 cells Sample 2 Square Number of cells 1 19 2 12 3 14 4 15 5 15 Total 75 cell Sample 3 Square Number

  2. Aim To study the effect of concentration of iodide ion ...

    To prepare 250 cm3 of sodium peroxodisulphate Na2S2O8 0.04 mol dm-3 solution, 2.381g of Na2S2O8 was weighed on the balance. After weighing, all the solute was diluted and transferred into a volumetric flask. Distilled water was added drop-wise till the calibration mark.

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