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4. (20 pts.) Calculate the pH of a 0.15 M NaOH solution AND classify the solution as acidic, neutral, or basic. a.) 0.82 basic b.) 0.82 acidic c.) 13.2 basic d.) 13.2 acidic 5. (10 pts.) Define POH a.) POH = -log [H*] b.) pOH = -log [OH ] c.) pOH = a² + b2 d.) pOH = 12 x 6. (20 pts.) For a solution with OH concentration of 5.6 x 10-²M, calculate the pH AND classify the solution as acidic, neutral, or basic. a.) 7.7 basic b.) -6.25 acidic c.) 6.25 acidic d.) O basic 7. (10 pts.) A measure of the amount of either acid or base a buffer can absorb while still resisting a change in pH is a.) always changing b.) not important c.) buffer capacity