Which is the formula for the hydroxide ion? ( )
A. OH-
B. H2O
C. H3O+
D. HCl
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Which is the formula for the acetic acid? ( )
A. HCl
B. HAc
C. HNO3
D. HF
If the pH of Coke is 3.12, [H3O+] is ( ).
A. 5.0×10-3 mol/L
B. 7.6×10-4 mol/L
C. 2.0×10-2 mol/L
D. 1.0×10-11 mol/L
If the pH of stomach acid is 3, [OH-] is ( ).
A. 5.0×10-3 mol/L
B. 1.0×10-3 mol/L
C. 2.0×10-2 mol/L
D. 1.0×10-11 mol/L
Which one of the following statements about acids is true? ( )
A. Strong acids are 100% ionized in water.
B. Acids can turn litmus paper blue.
C. Strong acids are very concentrated acids.
D. Weak acids are 100% ionized in water.
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