Monobasic acid: A monobasic acid is an acid that can donate one hydrogen ion (H+) per molecule in a chemical reaction. In other words, it has one replaceable hydrogen atom per molecule. When dissolved in water, monobasic acids produce one mole of H+ ions for every mole of the acid.

Dibasic acid: A dibasic acid is an acid that can donate two hydrogen ions (H+) per molecule in a chemical reaction. It has two replaceable hydrogen atoms per molecule. When dissolved in water, dibasic acids produce two moles of H+ ions for every mole of the acid.

Here is a table summarizing the key differences between monobasic and dibasic acids:

| Property | Monobasic acid | Dibasic acid |

|---|---|---|

| Number of replaceable hydrogen atoms per molecule | 1 | 2 |

| Number of H+ ions donated per molecule in a chemical reaction | 1 | 2 |

| Number of moles of H+ ions produced per mole of acid when dissolved in water | 1 | 2 |

Examples of monobasic acids include hydrochloric acid (HCl), nitric acid (HNO3), and acetic acid (CH3COOH). Examples of dibasic acids include sulfuric acid (H2SO4), carbonic acid (H2CO3), and oxalic acid (H2C2O4).