Questions & Answers

Question about acetate buffer and what happens when HCl is added to such a solution

Debra ask:How do I attack this problem?
I want to compare the effect of adding 1mmol of HCL to 100 ml of 0.2M acetate buffer at two different starting pH's.
(pKa of acetate buffer =4.7Initial pH = 4.7Initial pH = 5.7Thank you

Hi Debra,

There is both a short and long answer to your question. The short answer is that at pH=4.7 you are muchcloser to the equivalence point of your buffer (pH 4.7 when its a CH3COOHCH3COO- buffer) and at that pH the additionof HCl will cause a much larger change in pH than at pH=5.7.

However, you can calculate (this is the long answer) how much pH changes by doing some fairly simplecalculations. Since the explanation is not short I've made a separate webpage answering your question.It is named acetate buffer.The answer is also found as a pdf document named acetate buffer. The Excel spreadsheet showing allthe calculations is shownhere.


Question about glucose and ionic strength

Anonymous ask:what would be the ionic strenth of say 100mM Glucose? where there is no charge?

Dear Anonymous,

When there is no charge there is no contribution to the ionic strength. Ionic strength only counts charge ions.So, for any standard calculation glucose is not considered charged - and do not contribute to the overall ionicstrength of the solution. You can refer to the page about ionic strength.

Questions & Answers

Question about acetate buffer

Question about acetate buffer This is the long and computational answer to Debra's question about what happens when 100 mmol of HCl ispoured into an 100 ml acetate buffer (0.2 M) 06.07.2019 Author: Jim ...

Acids and bases - Broensted-Lowry definition

Acids and bases - Broensted-Lowry definition A more fundamental definition of acids and bases than the one provided on the index page was given by the Danish chemists Johannes Broensted. The definitions are:A Broensted acid is a proton doner.A Broensted base is a proton acceptor. The English chemist, Thomas Lowry, proposed exactly the same at roug...

PDF library

PDF library Note: Discussions about the pdf documents are found in the 'Help & Discussions' section. Inorganic chemistry subjects: Equilibriums 1 : A tutorial about how [CO2], [HCO3-] and[CO32-] are calculated from Total Inorganic Carbon.The pdf is here Ionic Strength 1 : An introduction about Ionic Strength with a simple calculation using H+...

pH meter pH strips

pH meter pH strips Background pH meters have been used since 1936 when they were invented by the Danish company Radiometer.In contrast to many other measuring devices pH meters do not measure concentrations, rather they measure activities. Tobe more specific the pH meter does not measure the concentration of hydrogen ions. pH meters are used to ...