A solution with [ OH-] of 5 x 10-3 has a pH of ________.?
A solution with a hydroxide ion concentration ([OH^-]) of (5 \times 10^{-3}) M has a pH of __. What is the correct calculation to determine the pH from this hydroxide ion concentration?
1 Answers
Step 1: Find the pOH.
pOH = -log[OH-]
pOH = -log(5 x 10^-3)
By the way the “^” symbol here means “to the power of”.
Put that into your scientific calculator and you should get something like:
pOH = 2.301029996
Step 2: Now that you have your pOH, subtract that from 14 to get your pH.
pH = 14 – pOH
pH = 14 – 2.301029996
pH = 11.69897
There you go.
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