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A level chemistry help- Urgent

Hi, Can you please help me with 3b, i don't understand.
Screenshot 2022-05-15 at 22.21.24.png
(edited 1 year ago)
Reply 1
Original post by vesq
Hi, Can you please help me with 3b, i don't understand.
Screenshot 2022-05-15 at 22.21.24.png

In that question the 1cm3 of 1 mol dm-3 iodine is diluted with the other two reactants so the initial concentration of iodine is actually 0.01 mol dm-3. This corresponds to the absorbance of 0.80. As you are told that the relationship between iodine concentration is proportional, you just have to use ratios to find the iodine concentration that has an absorbance of 0.18
Reply 2
Original post by alegb_
In that question the 1cm3 of 1 mol dm-3 iodine is diluted with the other two reactants so the initial concentration of iodine is actually 0.01 mol dm-3. This corresponds to the absorbance of 0.80. As you are told that the relationship between iodine concentration is proportional, you just have to use ratios to find the iodine concentration that has an absorbance of 0.18

I already saw this exact answer somewhere, i didn't understand, so thats why im asking

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