Question

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w05_qp_1.pdf
Q34

Answer 1

is it B

Answer 2

could you explain to me why option 1 is correct?

Answer 3

H+ + 0H- ---> H20
neutralisation reaction, which means it reduces the contents in the product side, according to le chateliers principle, the forward reaction is favoured

Answer 4

which will make it dissolve more

Answer 5

Hydroxyapatite will be more soluble?

Answer 6

yes, Hydroxyapatite is the tooth enamel, so it dissolves reducing the enamel size

Answer 7

in the second equation PO4-3 will react with the proton

Answer 8

yes same way as itt is in first

Answer 9

which would decrease its concentration and when the concentration decrease equilbrium would shift to the right in the first equation

Answer 10

correct!

Answer 11

and more OH ions would be produced so how is this possible H+ + 0H- ---> H20

Answer 12

if the proton reacts with PO4-3 ion

Answer 13

h20 is produced not 0h

Answer 14

wht is da marking scheme answer

Answer 15

its B

Answer 16

ok

Answer 17

thank you :D

Answer 18

no probs:)

Answer 19

When the hydrogen ions react with PO4-3 Both concentrations decrease in equilbria 1 and therefore equilbrium shifts towards the right so more Hydroxide ions are produced my question here is on the way to make hydroxyapatite soluble, is it because in equilbrium reaction does not go to completion so some hydrogen ions react with hydroxide ions are neutralised by some H+ to form water causing hydroxyapatite to dissolve

Answer 20

the original question seems to be answered, open a new thread if you want to ask a new one.

Answer 21

can you look at my previous reply if its a correct explanation or not

Answer 22

i got class now, i'll look at it later

Answer 23

ok good luck with your class :)

Answer 24

yes thats right @Abmon98