4.2 - Strong Acids & Weak Acids Questions and Answers

4.2 - Strong Acids & Weak Acids Questions and Answers A substance which forms an aqueous solution with a pH of less than 7 is defined as: An acid When acid molecules are added to water and split apart, we say that they 'ionise' or 'dissociate'. These two words both mean the same thing. Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:01 / 0:15 Full screen Brainpower Read More Strong acids ionise completely, whereas weak acids only partially ionise. Which of the following substances are strong acids? - Ethanoic acid - Sulfuric acid - Hydrochloric acid - Citric acid - Nitric acid Sulfuric acid Hydrochloric acid Nitric acid The dissociation of weak acids is a reversible reaction, which means that the products can react together to reform the acid. True For a weak acid, does the position of equilibrium lie to the left or the right? Left Which of the following substances are weak acids? (Select all that apply) - Ethanoic acid - Carbonic acid - Hydrochloric acid - Citric acid - Nitric acid Ethanoic acid Carbonic acid Citric acid Carbonic acid is described as a weak acid. Which of the following statements apply to carbonic acid? - It does not fully ionise to release hydrogen ions - It does fully dissociate to release hydrogen ions - It will form a solution with a pH of more than 7 - It will form a solution with a pH of less than 7 It does not fully ionise to release hydrogen ions It will form a solution with a pH of less than 7 Which of these describes the strength of an acid? The proportion of acid molecules which dissociate into hydrogen ions The concentration of an acid refers to the number of moles of acid molecules per unit of volume. For example, hydrochloric acid could be 2 mol/dm3, which would mean 2 moles of HCl molecules per dm3 of solution. The strength of an acid is the same as its concentration. False pH is a measure of the hydrogen ion (H+) concentration of the solution. This is NOT always the same as the acid's concentration. As the concentration of hydrogen ions in a solution increases, what happens to the pH? The pH decreases A solution decreases from pH 6 to pH 5. By what factor has the concentration of hydrogen ions increased? 10 x