In this experiment, we titrate the weak acid with strong base. As we were major in chemistry, titration is very common thing to do in the lab. But, the aim is different. In normal titration, we titrate to neutralized the acid by using the base. But in this experiment, we titrate to measure the pH to get the pKa. Therefore, this is a new thing for me to learn and understand this topic. After that, this experiment need us to be very patient as we need to rinse the pH meter and wipe it every time we titrate 1mL of base into the acid. To be put in the nutshell, we learn a lot from this experiment even though there are error in our result.
Reflection by: Aqmarollah bin Mohd Nasip
After done the
experiment, I am able to strong my knowledge on basic steps of titration. I am
also can refresh my memory on acid and base topic. By doing this experiment, I
can know the reaction of base with strong and weak acid. Weak acid take a long
time to raise pH 14 when reacted with strong base in this experiment. I am
rarely use the pH meter in the lab but in this experiment, I know how to handle
it with a correct steps. Usually in the experiment involving titration acid and
base, phenolphthalein will be added, but in this case it do not involved
because we only want to know the pH not the colour changing. This is a new
thing for me. I hope I will be able to know more by doing the next experiment.
Reflection by: Afifah Syafikah binti Azizan
From this Acid Base Titration experiment, what did I get out of it is I know how to use pH meter correctly. I had use pH meter during my semester 3 but not very properly because I not wash the pH meter after test the solution then I used to test the another solution. That mean the value of the pH was wrong. I also know the property of weak acid when pH changes and how to prepare the buffer sytem. Since we know the pKa is a property of weak acid we select for our buffer, so we can control the pH by manipulating the proportion of weak base and weak acid in solution. But when we finished our experiment, we did not get the positive result even though all of us are major in Chemistry. We had experienced how to titrate acid-base every semester in our chemistry subject but in this experiment we did not apply what we had learn before this that why our result wrong.
