User:Enalumenya/Temp/PRACTICAL CHEMISTRY S.5 JULY 2010.doc
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PRACTICAL CHEMISTRY
INSTRUCTIONS: Answer all questions in the spaces provided.
You are provided with the following solutions:
FA1; which contains a mixture of sodiumhydroxide and anhydrous sodiumcarbonate per 250cm3 of solution.
FA2; which is 0.05M hydrochloric acid.
You are required to determine the composition by mass of FA1.
Procedure
- Pipette 25cm3 of FA1 into a conical flask and titrate with FA2 using phenolphthalein as indicator. Repeat the titration two times and record your results in the table below:
Results
Volume of pipette used = …………………cm3
Burette reading | 1 | 2 | 3 |
Final reading/cm3 | |||
Initial reading/cm3 | |||
Volume used/cm3 |
Average volume used =
- Pipette 25cm3 of FA1 into a conical flask and titrate with FA2 using methylorange as indicator. Repeat the titration two times and record your results in the table below:
Burette reading | 1 | 2 | 3 |
Final reading/cm3 | |||
Initial reading/cm3 | |||
Volume used/cm3 |
Average volume used =
Calculations (Na = 23; C = 12; O = 16; H = 1)
- Deduce the volume of hydrochloric acid required for complete neutralization of:
- Sodiumcarbonate
- Sodiumhydroxide
(b) Determine the composition by mass of FA1.