27. Calculate [H+] in a 0.40 M solution of NaH2PO4. (For H3PO4, Ka1 = 7.5 × 10^-3, Ka2 = 6.2 × 10^-8, Ka3 = 4.8 × 10^-13) (A)2.2 × 10^-5 M (B)1.6 × 10^-4 M (C)0.40 M (D)2.5 × 10^-4 M (E)3.9 × 10^-11 M

8. A Lewis dot structure for benzene, C6H6 would give two equivalent resonance structures for this cyclic molecule with alternating single and double bonds. A combined LCAO and MO picture for the bonding of the carbon atoms in benzene would be (A)1σ(Csp2-Csp2) bonds between each C atom, and 3π MO delocalized over the C's (B)2σ(Csp3-Csp3) bonds between each C atom, and 1π MO delocalized over the C's (C)1σ(Csp3-Csp3) bonds between each C atom, and 1π MO delocalized over the C's (D)1σ(Csp2-Csp2) bonds between each C atom, and 2π MO delocalized over the C's (E)3σ(C2p-C2p) bonds between each C atom

27. Calculate [H+] in a 0.40 M solution of NaH2PO4. (For H3PO4, Ka1 = 7.5 × 10^-3, Ka2 = 6.2 × 10^-8, Ka3 = 4.8 × 10^-13)
(A)2.2 × 10^-5 M
(B)1.6 × 10^-4 M
(C)0.40 M
(D)2.5 × 10^-4 M
(E)3.9 × 10^-11 M

相關試題

相關試卷