题目内容

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

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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

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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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30 g of salt is added to 70 g of water. Then the weight percent of the salt solution is ( ).

A. 10%
B. 20%
C. 30%
D. 70%

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What's your major

A. MBBS
B. Pharmacy

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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 ( ).

Which one of the following statements about acids is true? ( )

30 g of salt is added to 70 g of water. Then the weight percent of the salt solution is ( ).

What's your major

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