We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy

To Investigate the Percentage of CaCO3 in a Sample of Marble Essay Sample

  • Pages: 3
  • Word count: 552
  • Rewriting Possibility: 99% (excellent)
  • Category: acid

Get Full Essay

Get access to this section to get all help you need with your essay and educational issues.

Get Access

Introduction of TOPIC

Materials used:

* Beaker

* Conical Flask

* Measuring Cylinder of 15 cc

* Burette

* Indicator

* Clamp Stand

* Pipette

* Beam Balance

* HNO3 of 2M concentration

* NaOH of 2M concentration

Procedure :

* Crush the sample of marble in to small pieces, and take 1 gram of it in a beaker

* Add excess of acid into the beaker, allow to react completely

* Pipette 25 cc of the mixture into the conical flask

* Add 2 drops of indicator (phenolphthalein) in the conical flask

* Rinse the burette with NaOH, then fill it with the latter up to the 0 cc mark

* Titrate the mixture with the base until color changes to purple. In the process, shake the conical flask thoroughly

* Calculate the amount of base reacted

* Repeat t

he titration again to improve accuracy. Data Collection :

Sorry, but full essay samples are available only for registered users

Choose a Membership Plan
style="text-align: justify;">Burette reading (NaOH) / cc

HNO3 + marble used

















Mass of marble used = 3 grams

Amount of acid used to dissolve the marble, 100 cc = 0.1 dm3

Volume of mixture taken = 0.025 dm3

Mean volume of NaOH used = 18.76 cm3 = 0.01876 dm3

CaCO3(s) + 2HNO3(aq) Ca(NO3)2(aq) + H2O(l) + CO2(g)

Mol of HNO3 used = 0.1 x 2M = 0.2 mol

Molar ratio of NaOH ~ 0.01876 x 2 = 0.03752 mol

Mol in 0.1 dm3 of NaOH = 0.03752 x 4 = 0.15008 mol

Mol reacted with HNO3 = 0.2 – 0.15008 = 0.04992 mol

Mol of CaCO3 = 0.04992 = 0.02496 mol

Mass of CaCO3 = 0.02496 x 100 = 2.496 grams

% of CaCO3 = 2.496/3 x 100% = 83.2 %

Precautions taken :

Make sure that the marble reacted completely with the acid, it may take quite a long time, but we are not allowed to proceed with the titration until the marble is completely reacted, because it will give us incorrect readings.

Care should be taken when titrating the mixture of acid and marble with NaOH. Because color changes may occur more than once, so we need to be attentive in the process.

We can write a custom essay on

To Investigate the Percentage of CaCO3 in a Sample ...
According to Your Specific Requirements.

Order an essay

You May Also Find These Documents Helpful

Necessary actions synonym

If you suspect that an individual is being abused, there are some necessary actions for you to take along with researching about what your companies policies and procedures around abuse are. Initially, if you suspect that a service user or worker is being abused, it is important, for you to take your assumptions seriously and remember that they are not meaningless. As a social care worker, you have a responsibilty to care and protect the adults that you work with, so you must remain vigilant around all safeguarding situations. You will also be required to collect all evidence, this evidence should remain confidential and professional. Along with evidence, you may be required to make note of all possible observations, these notes must be dated, signed and only shared between necessary participants. It is also important to bear in mind that not all service users may be aware that they are...

Acid base indicators

In the strong acid-weak base titration, 0. 1 M ammonium hydroxide ( NH4OH ) was titrated with 0. 1 M hydrochloric acid ( HCl ). 2 drops of phenolphthalein were added as indicator into the conical flask which contains 25mL of hydrochloric acid, the mixture in the conical flask was colourless. Ammonium hydroxide was then titrated slowly into the conical flask and the conical flask was swirled gently to ensure complete reaction between the strong acid and weak base. The titration stops when the colour of the titrand changed from colourless to pale pink. The average titrant (29. 55 mL) of 0. 1 M of ammonium hydroxide was added into the conical flask. Phenolphthalein was then replaced by screened methyl orange as an indicator, the initial colour of the mixture in the conical flask was red. The average titre of (26. 45 mL) of 0. 1 M of ammonium hydroxide...

Production of sulphur dioxide

Introduction Currently, fertilizers used on the West Coast are made and then transported from other parts of New Zealand. Because fertilizers have a reasonably large mass the cost of this transport can be expensive. This report will investigate the processes involved in making superphosphate fertilizer, including the manufacture of sulfuric acid from sulfur using the contact process. Also in this report will be an outline of the positive and negative effects that using this particular fertilizer has on the environment, as well as any possible effects that the manufacturing process will have on the environment. Making sulphuric acid Sulphuric acid is the main component in the process of making superphosphate fertilizer and in terms of mass is the most abundantly produced chemical in the world. Sulphuric acid is made from sulfur using the contact process as mentioned earlier. When making superphosphate fertilizer, the sulphuric acid needed will be made on...

Popular Essays


Emma Taylor


Hi there!
Would you like to get such a paper?
How about getting a customized one?