Explain the preparation of chemical reagents, Chemistry

Assignment Help:

Preparation of chemical reagents

I. Purpose of the Experiment

A reagent is any substance in a chemical reaction. Different reagents are used for laboratory experiments depending on the nature and type of experiment.

II. Introduction

Concentration of a solution is the number of moles of solute present per litre of the solution. It can be expressed in terms of Molarity.

Molarity:  The number of moles of  solute dissolved in one litre of solution

Molarity= mol (Moles of solute) / L (Litre of solution)

Mole(mol) =    mass (g) / Molar mass(g/mol)

Molar Mass (g/mol) : mass for one mole of any substance

III. Experimental

1. Chemicals: Sodium Hydroxide (NaOH) pellets, Sulphuric Acid solution

( H2SO4, 96%w/w, density 1.84 g/mL), Potassium Permanganate (KMnO4 crystals)

2 Equipment: Volumetric flask, Funnel, Watch glass, Spatula, Stirrer (Glass Rod), Polyethylene wash bottle, Reagent bottle, Measuring cylinder, Electronic Balance.

3 Procedure:

a. Preparation of approximately 0.1 M NaOH solution 1000mL.

-  The empty watch glass was weighed by using electronic balance.

-  Then approximately 4 g of NaOH added (poured) into watch glass which has the weighed

-  Small amount of water was added to 100mL volumetric flask & NaOH      pellets was poured through funnel into it.

-  Funnel was removed. The solution was then swirled  it until it became homogeneous. This will give a solution with approximately 0.1 M

b. Preparation of approximately 0.05 M H2C2O4. 2H2O solution 1000mL.

-  6.4g of H2C2O4. 2H2O  crystals was placed on a watch glass and weighed again.

-  Weighed H2C2O4. 2H2O   crystals were poured to a volumetric flask using a funnel and small amount of distilled water was add to a volumetric flask by using a funnel.

-  The glass stopper of the volumetric flask was placed and the mixture was then swirled thoroughly  until all H2C2O4. 2H2O   crystals were dissolved.

-  Distilled water was filled up to the marking and was mixed by shaking. This will give approximately 0.05 M.

c. Preparation of approximately 0.1 M H2SO4 solution 1000mL.

-  5.4  mL of H2SO4 was measured with a measuring cylinder.

-  H2SO4 was slowly poured through a funnel into the volumetric flask previously filled with 300mL of distilled water (made up the volume up to 1000mL and mixed it)

- A solution of H2SO4 will gave with approximately 0.1 M.

IV. Results and Discussions

(i) Molarity of NaOH solution......... 0.10M.

(ii) Molarity of H2C2O4. 2H2O   solution......... 0.05M.

(ii) Molarity of H2SO4 solution......... 0.10M.

Discussion

1. What will you do, if the solution becomes hot while preparing NaOH solution?

I will pour cold water on the outer surface of the volumetric flask to cool it off

2. What will happen if distilled water is poured to H2SO4?

Heat is produced because the reaction is exothermic

3. What will you do if KMnO4 crystals are big and difficult to dissolve in distilled water?

Crush /grind them before adding in water to increase the surface area for dissolving.

V. Conclusion

Approximately 0.10 M NaOH solution, 0.05 M H2C2O4. 2H2O    solution and

0.10 M H2SO4 solutions were prepared for further laboratory use.


Related Discussions:- Explain the preparation of chemical reagents

Nitro compounds have higher boiling points, i) Electrophillic substitution ...

i) Electrophillic substitution in case of aromatic amines takes place more readily than benzene. ii) Nitro compounds have higher boiling points than hydrocarbons having almost s

Succinic acid, Evolution of succinic acid,Physical and chemical properties ...

Evolution of succinic acid,Physical and chemical properties of succinic acid,succinic acid uses,succinic acid derivatives,succinic acid production techniques,biotechnology of succi

How to check alcl3 polar or not, Is AlCl 3 polar.........? If not then why...

Is AlCl 3 polar.........? If not then why does it react with H 2 O? Also is NaCl non polar?How to decide whether a given compound is polar or not?? solution) If a bond is between

Crystallization, explain crystallization as a method of separating mixture

explain crystallization as a method of separating mixture

Discuss effect of impurity and temperature, Discuss effect of impurity, tem...

Discuss effect of impurity, temperature and alloying on the electricity conductivity of metal. For an ideal crystal with no impurities and imperfections mean free path at 0 K i

#gas, two containers are connected by a stopcock. gas A is at pressure 202k...

two containers are connected by a stopcock. gas A is at pressure 202kpa while gas B is at pressure 140kpa, what will be the resultant pressure when the stopcock is opened

Blow moulding and thermoforming extensively, write on blow moulding and the...

write on blow moulding and thermoforming extensively. 3 pages

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd