How does carbonic acid affect pH? Chemistry Acids and Bases pH 1 Answer anor277 Dec 24, 2016 It lowers #pH# slightly......... Explanation: Carbonic acid is #H_2CO_3# or is perhaps better represented as hydrated carbon dioxide, #H_2O*CO_2#. Carbonic acid can be deprotonated to give #[HCO_3]^-#. Answer link Related questions How do you determine pH from pKa? How do pH values of acids and bases differ? How do you calculate something on a pH scale? How do you calculate pH diprotic acid? How do you calculate pH from acid dissociation constant? How do you calculate pH of acid and base solution? Why is the pH scale 0-14? Is pH a measure of the hydrogen ion concentration? How does solubility affect pH? How does pH relate to pKa in a titration? See all questions in pH Impact of this question 4825 views around the world You can reuse this answer Creative Commons License