# OCR A Level chemistry question help

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#1
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!
0
2 months ago
#2
(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?
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#3
(Original post by Pigster)
Were you given the molecular formula of chloroxylenol?

this was all that was given
0
2 months ago
#4
(Original post by confusedmind09)

this was all that was given
You're given the displayed formula, from that you can work out the molecular formula. Apply HA <-> H+ + A- to that.
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#5
(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!!
0
1 month ago
#6
(Original post by confusedmind09)
thank you very much!!
How did you solve it bc im confused as well ?
0
1 month ago
#7
I’ve got the 2020 papers for bio chemistry and physics if anyone needs them .message me on insta for them @griefluencer
0
1 month ago
#8
(Original post by shreya_2003)
How did you solve it bc im confused as well ?
0
1 month ago
#9
(Original post by isobel748)
Im pretty sure it is
0
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