All of the following can be used to define a base a. a hydronium ion donor in a reaction b. a substance that increases the concentration of hydroxide ions c. an electron pair donor in a reaction d. a substance that is a hydrogen ion acceptor in a reaction

All of the following can be used to define a base except__.

Out of all the options presented above the one that cannot be used to define a base is answer choice A) a hydronium ion donor in a reaction. As we already know a base is a compound that is a proton (H¹⁺) acceptor.

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Answer/when the cell uses energy;

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.