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OCR A Level chemistry question help

A student measures the pH of the contents in a bottle of Dettol® as 5.14.
The label on the bottle shows the percentage of chloroxylenol in Dettol® as 4.80%
i.e. 100cm3 of Dettol® contains 4.80g of chloroxylenol.
Assume the following:
• Chloroxylenol is the only acidic component in Dettol®.
• Chloroxylenol is a weak monobasic acid.
• The density of Dettol® is 1.00gcm−3.

Write the equation, using molecular formulae, for the acid dissociation of chloroxylenol.
Calculate the acid dissociation constant, Ka, for chloroxylenol.

hi please can someone help me with this? I'm so confused!
Reply 1
Avatar for Pigster
Pigster
20
Original post by confusedmind09
A student measures the pH of the contents in a bottle of Dettol® as 5.14.
The label on the bottle shows the percentage of chloroxylenol in Dettol® as 4.80%
i.e. 100cm3 of Dettol® contains 4.80g of chloroxylenol.
Assume the following:
• Chloroxylenol is the only acidic component in Dettol®.
• Chloroxylenol is a weak monobasic acid.
• The density of Dettol® is 1.00gcm−3.

Write the equation, using molecular formulae, for the acid dissociation of chloroxylenol.
Calculate the acid dissociation constant, Ka, for chloroxylenol.

hi please can someone help me with this? I'm so confused!


Were you given the molecular formula of chloroxylenol?
Original post by Pigster
Were you given the molecular formula of chloroxylenol?

https://docs.google.com/document/d/15ShivaJqL56khxJ_L-7pLssJS7C6w3KdqIuvDclIEoc/edit?usp=sharing

this was all that was given:smile:
Reply 3
Avatar for Pigster
Pigster
20
Original post by confusedmind09

You're given the displayed formula, from that you can work out the molecular formula. Apply HA <-> H+ + A- to that.
Original post by Pigster
You're given the displayed formula, from that you can work out the molecular formula. Apply HA <-> H+ + A- to that.

thank you very much!!
Original post by confusedmind09
thank you very much!!

How did you solve it bc im confused as well ?
I’ve got the 2020 papers for bio chemistry and physics if anyone needs them .message me on insta for them @griefluencer
Original post by shreya_2003
How did you solve it bc im confused as well ?

Is the answer 1.72x10^-10 ?
Original post by isobel748
Is the answer 1.72x10^-10 ?

Im pretty sure it is

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