MCAT Physics Question -- pH | Next Step Test Prep MCAT Physics Question -- pH | Next Step Test Prep

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A NaOH solution has an  OH concentration of 1×10-5M. What is the pH of the solution?

a) 2

b) 5

c) 9

d) 12

Explanation

Two relationships are necessary for this solution:

pOH = -log[OH]     and    pOH + pH = 14

 

pOH = -log[1×10-5] = 5, and 14 – 5 = 9.

 

a) 2, incorrect, This results from subtracting the pOH from 7.

 

b) 5, incorrect, This is the pOH.

 

c) 9, correct.

 

d) 12, incorrect, This results from adding the pOH to 7.

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