Using concentrations of solutions

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4 Terms

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Concentration

Mass of solute or number of moles in given volume of solution

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Concentration=

Number of moles/ volume

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Mass=

Moles x RFM

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Titration required practical steps

  1. Use pipette to transfer 25cm³ of sodium hydroxide solution into a conical flask

  2. Conical flask reduces risk of splashing

  3. Add 5 drops of indicator such as methyl orange to alkali in conical flask

  4. Place conical flask on white tile to observe colour change

  5. Fill burette with sulfuric acid.

  6. Add acid to alkali until solution is neutral, swirl the solution to make sure acid and alkali mixed

  7. Indicator changes from yellow to red. Once colour change observed, add acid drop by drop until neutral solution.

  8. Read volume of acid added from burette. Eye should be in level with the surface of the liquid. Liquid naturally curves, meniscus. Read from bottom of meniscus.

  9. Calculate concentration of acid