Can you calculate pH, pOH, [H+], [OH-] ?

HoangDDS said:

no calculator please, approximation only.

warm up:
1) pH= 3 , [H+] = 1x10^-3

2) pOH=4, pH = 10

3) [H+] = 1 x 10^-2 M , [OH-]= ?

the good stuff:

4) pH = 2.3, [H+] = ?
a) 5 x 10^-1 M
b) 5 x 10^-2 M
c) 5 x 10^-3 M
d) 5 x 10^-4 M

5) [OH-] = 7 x 10^-8, pOH= ?
a) 6.2
b) 7.2
c) 8.2
d) 7.8

6) pOH = 10.9 , [H+]= ?
a) 8 x 10^-3 M
b) 8 x 10^-4 M
c) 8 x 10^-5 M
d) 8 x 10^-6 M

Let me know if these questions are lame and we do not need to answer these type of questions for the DAT. Or if these are valid questions to understand.
I'll post answers and explanation later tonight. Feel free to explain to us how you got it too. (it took me a really long time to understand how to calculate these)

Thanks. Good luck everyone!!

Click to expand...

HoangDDS said:

no calculator please, approximation only.

warm up:
1) pH= 3 , [H+] = 1 x 10^-3 M

2) pOH=4, pH = 10

3) [H+] = 1 x 10^-2 M , [OH-]= 1 x 10^-12 M

the good stuff:

4) pH = 2.3, [H+] =?
a) 5 x 10^-1 M
b) 5 x 10^-2 M
c) 5 x 10^-3 M
d) 5 x 10^-4 M

5) [OH-] = 7 x 10^-8, pOH= ?
a) 6.2
b) 7.2
c) 8.2
d) 7.8

6) pOH = 10.9 , [H+]= ?
a) 8 x 10^-3 M
b) 8 x 10^-4 M
c) 8 x 10^-5 M
d) 8 x 10^-6 M

Let me know if these questions are lame and we do not need to answer these type of questions for the DAT. Or if these are valid questions to understand.
I'll post answers and explanation later tonight. Feel free to explain to us how you got it too. (it took me a really long time to understand how to calculate these)

Thanks. Good luck everyone!!

Click to expand...