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- ⌡@AtGraphic 130,100
- '@Picture AED20_01.bmp
- @At 135,15
- What is the molarity of a solution of 2g sodium hydroxide dissolved
- in 100ml of water?
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- @Prompt
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- @AtGraphic 130,200
- '@Picture AED20_02.bmp
- @At 134,80
- Step 1 Convert the volume to a litre and find equivalent mass
- 100ml is a 1/10th of a litre so it needs to be multiplied by 10
- to convert it to a litre.Equivalent concentration = #[N]g/l
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- '@Answer 20
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- '@Feedback Wrong
- '#bNo#b, to find the equivalent mass you should multiply by the
- 'same factor that was used to convert the volume to a litre.
- 'In this case this is 10.
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- '@Animation BoseGrim
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- '@Feedback Correct
- '#bCorrect!#b
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- '@Animation BoseSmile
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- @Question
- @Prompt
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- @AtGraphic 130,300
- '@Picture AED20_03.bmp
- @At 130,149
- Step 2 Find RMM of solute
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- RMM of NaOH = #[N36]
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- '@Answer 40
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- '@Feedback Wrong
- '#bNo#b, to find the RMM of NaOH add up the RAMs
- '23 + 16 + 1 = 40
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- '@Animation BoseGrim
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- '@Feedback Correct
- '#bCorrect!#b
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- '@Animation BoseSmile
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- @Question
- @Prompt
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- @At 124,210
- Step 3 Find the number of moles of solute
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- No of moles of NaOH = mass = #[N36] = #[N36]
- RMM #[N36]
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- '@Answer 20,40,0.5
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- '@Feedback Wrong
- '#bNo#b,
- '@Animation BoseGrim
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- '@Feedback Correct
- '#bCorrect#b
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- '@Animation BoseSmile
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- @Question
- @Prompt
- @At 129,303
- Step 4 Write down the molarity
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- The molarity of a solution of 2g of NaOH dissolved in 100ml
- of water is #[N36]mol dm-3
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- '@Answer 0.5
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- '@Feedback Wrong
- '#bNo#b, you know how many moles would be dissolved in 1 litre
- '- this is the molarity.
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- '@Animation BoseGrim
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- '@Feedback Correct
- '#bWell done#b, you now know how to find the molarity of a solution.
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- '@Animation BoseSmile
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- '@Animation BoseSmile
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