pH question (1 Viewer)

[em_angel23]

http://www.boardofstudies.nsw.edu.au/syllabus_hsc/pdf_doc/chemistry_specexam.pdf

The answer is 25,
help! i keep getting 14!
thanks in advance.

Question 9, page 16

 

[Top Secret]

Hydrogen ion concentration at a pH of 8.6 = 10^-8.6
Hydrogen ion concentration at a pH of 10 = 10^-10

Therefore factor at which hydrogen ion concentration decreases = (10^-8.6) / (10^-10) = 25

 

[em_angel23]

thanks so much

 

[theresekathryn]

did you use log base e on your calculator instead of log base 10?

 

[em_angel23]

did you use log base e on your calculator instead of log base 10?

no, i was just doing it completely wrong haha!

 

[aero135]

Umm makes sense hydrogen ion concentration. I havent got time to look at it closely but anincrease in ph by 1 will increase H+ ions by 100. Do you have answers
please post them up. I want to have a look!

cherers

 

[em_angel23]

Umm makes sense hydrogen ion concentration. I havent got time to look at it closely but anincrease in ph by 1 will increase H+ ions by 100. Do you have answers
please post them up. I want to have a look!

cherers

I don't have the answers, it was in the multiple choice online so i knew the answer from that, and then i looked up to see which year it was from