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- @AtGraphic 130,100
- '@Picture AED30_01.bmp
- @At 135,15
- In this experiment you are going to find out the concentration
- of the sodium hydroxide solution in the flask.
- @PlaySoundFile AED30_01.wav
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- @Prompt
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- @At 133,72
- In the flask is 100ml of NaOH of unknown concentration with
- an indicator called phenylalanine which is pink in an alkali but
- goes colourless in a neutral solution.
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- @Prompt
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- @At 130,153
- In the burette we have a solution of sulphuric acid with a concentration
- of 1 mol dm-3.
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- #b#crClick on the burette tap to run the acid into the flask.#b
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- @GoForward 282,245,50,50,0
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- @onForwardGoto screen_35
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- moles in 50ml = #^50 x 1 = #[N36] moles
- #t#[N36]
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- Step 3 Work out the Mole ratio
- Mole ratio of H2SO4 : NaOH = #[N36] : #[N36]
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- Step 4Calculate the number of moles of the second reactantNo
- of moles of NaOH reacting = #[N36] moles
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- Step 5 Work out concentration in given volume.
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- Concentration of NaOH = #^#[N36] x #[N36]= #[N36] mol dm-3
- #t100
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