Everything You Need in One Place
Homework problems? Exam preparation? Trying to grasp a concept or just brushing up the basics? Our extensive help & practice library have got you covered.
Learn and Practice With Ease
Our proven video lessons ease you through problems quickly, and you get tonnes of friendly practice on questions that trip students up on tests and finals.
Instant and Unlimited Help
Our personalized learning platform enables you to instantly find the exact walkthrough to your specific type of question. Activate unlimited help now!
Make math click 🤔 and get better grades! 💯Join for Free
- Calculate the pH change that takes place when acid or base is added to buffer solutions.
A 1L buffer solution is made from 0.4 mol ethanoic acid (CH3COOH) and 0.4 mol of its conjugate base, ethanoate (CH3COO-). The Ka of ethanoic acid is 1.4*10-5.
What would be the pH change if 0.1 mol of H3O+ was added to this buffer?
- Show the effect of a buffer using a titration curve and find Ka of a weak acid in a buffer.
Below is the titration curve of a weak acid by a strong base:
- At which point in the titration is a buffer effect occurring? Mark the region on the graph.
- pH1/2 during this titration was 3.82. Find the Ka of the weak acid in the buffer using the Henderson-Hasselbach equation.
- Calculate the concentration of solutions needed to prepare a buffer of a given pH.
Ethanoic acid has a Ka of 1.4*10-5. What amounts are required to prepare a 100mL buffer with pH 4.25 using ethanoic acid, CH3COOH and sodium hydroxide, NaOH?
1 Source for acidity constant (Ka) data: ATKINS, P. W., & DE PAULA, J. (2006). Atkins' Physical chemistry. Oxford, Oxford University Press.