a buffer is a substance which?
a) accepts OH- in basic solution
b) accepts H+ in acid solutions
A buffer is a solution that resists a change in pH. A buffer will accept OH^- FROM a basic solution AND it will accept H^+ FROM an acid solution.
To determine the correct answer, we can examine the properties of a buffer solution.
A buffer is a substance or a mixture of substances that helps to stabilize the pH (acidity or basicity) of a solution by resisting changes in the hydrogen ion (H+) concentration when an acid or base is added. In other words, a buffer helps maintain a relatively constant pH.
Now, let's evaluate each option:
a) Accepts OH- in basic solution: In a basic solution, the concentration of hydroxide ions (OH-) is higher. If a substance accepts OH- ions, it would actually increase the pH, making the solution more basic. Therefore, this option is incorrect.
b) Accepts H+ in acid solutions: In an acidic solution, the concentration of hydrogen ions (H+) is higher. If a substance accepts H+ ions, it can combine with them to help decrease the excess of H+ ions, effectively maintaining the pH. This property aligns with the definition of a buffer. Therefore, this option is correct.
In conclusion, the correct answer is b) accepts H+ in acid solutions. A buffer substance helps to accept or react with hydrogen ions (H+) in acid solutions to maintain a stable pH.