What is the pH of a 0.00001 molar HCl solution?
A. 1
B. 4
C. 5
D. 9
By definition pH is the negative log (logarithm) of the hydronium ion concentration. A 0.00001 molar solution has a H+ concentration of 10-5 M (move the decimal point 5 places to the right). The value of the negative exponent (-5) gives a pH of 5.
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Added: 7/2/2008
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Founded by JPlantesMD
While these questions do not fit the MCAT format (they have no related reading passages) they cover concepts one should understand in order to do well in the physical sciences portion of the MCAT.

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