Answers Foothill-B Period-Chemistry-2627B pHQuestion 7

7

AssignmentMultiple Choice

pH

Question 7 • Foothill-B Period-Chemistry-26/27B

Which of these statements best explains why pure water has a pH of 7?

Answer

A

Pure water contains only H2O molecules, but pH is based on the concentration of H3O+ ions.

B

Each molecule of water can dissociate to form 7 H3O+ ions.

C

Water self-ionizes to form an equilibrium system that has [H3O+] = 1.0 × 10–7 M.

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