16. If you have a solution with a pH of 3, what is the [OH^-] concentration? A) 1times 10^-11M B) 1times 10^-10M C) 1times 10^-7M D) 1times 10^-14M Ansv wer: A ) 1times 10^-11M

To find the $[OH^{-}]$ concentration from the given pH, we can use the relationship between pH, pOH, and the ion product of water ($K_w$).<br /><br />Given:<br />- pH = 3<br /><br />Step 1: Calculate pOH.<br />pOH = 14 - pH<br />pOH = 14 - 3<br />pOH = 11<br /><br />Step 2: Calculate $[OH^{-}]$ concentration.<br />$[OH^{-}] = 10^{-pOH}$<br />$[OH^{-}] = 10^{-11}$<br /><br />Therefore, the $[OH^{-}]$ concentration is $1\times 10^{-11}M$.<br /><br />Answer: A) $1\times 10^{-11}M$