SOLUTION: Please help me with this problem. I thought I had the right answer but it was wrong. First I came up with .316 and the 0. Show all work. Thanks The pH scale for acidity is def

Question 998735: Please help me with this problem. I thought I had the right answer but it was wrong. First I came up with .316 and the 0. Show all work. Thanks
The pH scale for acidity is defined by pH=−log 10 [H + ] where [H + ] is the concentration of hydrogen ions measured in moles per liter (M).
(A) The pH of Milk of Magnesia is 10.5. Calculate the concentration of hydrogen ions in moles per liter (M).
[H + ]=____________M

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The pH scale for acidity is defined by pH=−log 10 [H + ] where [H + ] is the concentration of hydrogen ions measured in moles per liter (M).
--------

(A) The pH of Milk of Magnesia is 10.5.
Calculate the concentration of hydrogen ions in moles per liter (M).
====
10.5 = -log10[H+]
----
log10[H+] = - 10.5
---
[H +] = 10^(-10.5) = 3.162..x10^-11
----
= 0.0000000003162_M
=====
Cheers,
Stan H.
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