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Given the pH of a sol'n is 7.4, what is the H_{3}0^{+} concentration
 10 ^ ^{pH }
 (Note: 7.40 is 2 places past decimal, your answer should be this: 4.0x10^{8 ) }

Given the pH of a sol'n is 9.61, what is the OH concentration
First find the pOH: 149.61 = 4.39. Now you can do this: 10 ^ ^{(4.39)} = 4.1x10^{5}

So, from pH to H30+
10^^{pH}

A sample of gastric juice has a H_{3}0^{+} concentration of 0.045. What is the pH
log (0.045) = 1.35 (since there are 2 sig figs in the concentration, put 2 places past the pH)

Given pK_{a} find K_{a}
logK_{a}

Know how to use the HendersonHasselbalch equation.
Remember that the [A^{}] is the CB SALT and [HA^{}] is the ACID. "A" for acid and use this acid's pK_{a}

