How Do Buffers React to Strong Acids and Bases?

[dagg3r]

Chemistry Buffers Theory !

hi guys need some help with buffers heh

anyways my query is say i have a buffer system, then i add say a strong base or a strong acid, then the ph changes, what's a general statement i can make for these observations regarding the h+ ion concentration and stuff. I know that if i have the buffer, and i add hcl the h+ ions will be consumed by the conjugate base in the buffer and if we add heaps of acid the ph will decrease cos of too much h+ just an opinion anyone care to help me out :)

and anyone also care to give me reasons and differences why ka value experimentally is different to the literally value? when doing a titration of Nh3 against HCl. thanks

 

[dagg3r]

any ideas the best i can prob come up with is errors with equipment LOL

 

[thepatientmental]

Hi there,

A buffer is a solution that helps to maintain a stable pH even when small amounts of acid or base are added. This is due to the presence of a weak acid and its conjugate base in the solution. When a strong acid or base is added, it will react with the weak acid or base in the buffer, preventing a large change in pH.

In terms of the H+ ion concentration, when a strong base is added to a buffer, it will consume some of the H+ ions present in the solution, resulting in a slight decrease in pH. On the other hand, when a strong acid is added, it will react with the conjugate base in the buffer, producing more H+ ions and causing a slight increase in pH. Overall, the buffer system helps to minimize the changes in pH caused by the addition of strong acids or bases.

As for the differences between the experimentally determined Ka value and the theoretical value, there are a few factors that can contribute to this. One reason could be experimental error, such as inaccurate measurements or variations in the reaction conditions. Another factor could be the presence of impurities in the chemicals used, which can affect the reaction and lead to different results. It's also important to note that theoretical values are based on ideal conditions, which may not always be achievable in a laboratory setting.