not really.. Its just teaching people to work with log..
Which isn't something you're required to do in this course. Your questions would probably be a lot more relevant if you took them from past papers until you're more familiar with how the HSC phrases its questions.
Let the concentration of hydrogen ions be
ItsLet the concentration of hydrogen ions be(which is unknown, since we don't know anything about the acid or base in the solution).
Then by definition, using change of base formula and without using base 10 for the log,.
Not really sure what the point of this is though, since it's a less simplified form than leaving it in base 10.
You've said the solution is 0.17 mol L-1, but that's not necessarily the concentration of H+.Its
Then type in calculator to find pH
Nope, this answer is incorrect (was on tapatalk earlier and couldn't see the response). Can any 15ers pick up on what's wrong with this?Can you use Latex for these type of question.
I don't think a question can get more pointless than this...
Just to clarify, is it magnesium ion or nitrate ion concentration you want to find?
This is the problem ive had for a long time i couldnt tell whether it was absolute or negative thanks therefore its -0.34+0.8=0.46
If you don't get why it has to be negative I think you might misunderstand the table of standard potentials. It's a table of standard reduction potentials, you're describing a different, equal but opposite, process when you describe oxidation. It would make no sense at all to use a positive here, because you'd be describing reduction, which isn't the process that's happening.
That's the correct answer. I posited that particular question because sometimes people think they have to double the value for Ag when that's not the case. But it didn't catch either of you so well done!Yeah i got 0.46V too
1. The HSC will never specify Tc-99m as the isotope you're required to write about. You have a choice of industrial/medical isotopes to study.
Im doing technitium and dont know whata in it for industry
You need to have a medical and an industrial isotope. Technetium-99m is great for medical, you'll need another for industry (cobalt-60 is good, plenty of uses and easy to find information on).
You do need to use natural log to calculate pH though...and calculation of pH questions are in exam paper.