20. What is the pH in a 615fdeb3386b1.jpgmol/L solution of boric acid (B(OH) 3)? 615fdee24a344.jpg615fdf1e39662.jpg?
(A) 5.92,
(B) 8.39,
(C) 6.21,
(D) 5.32,
(E) 7.56

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統計： A(0), B(1), C(1), D(0), E(0) #2788468