00:01
Hi, in this question they have asked about the titrations where here they have taken a noh and a weak acid and a strong acid, these are the graphs plotted, so we need to answer the following questions.
00:13
So what is the first question, which curve represents the titration of a weak acid? so the titration of the weak acid is represented by this graph, this is the weak acid graph, this is a strong acid, okay.
00:36
So what is the pka of weak acids? so for weak acid first we need to consider the reaction that is ha in water splits to give h3o plus and a minus, okay.
00:56
So for pka it is minus log ka or minus log concentration of h3o plus into concentration of a minus divided by the concentration of ha.
01:19
So this is the pka value of the weak acid.
01:26
So what is the initial concentration of each acid? so if you calculate the initial concentration, let us take it as n1 v1 is equal to n2 v2.
01:38
So we know the base, the normality and volume, so n1 into, we have taken acid, this is acid base, okay.
01:52
So 10 ml of weak acid or strong acid is equal to 0 .1 molar into 10 ml.
02:02
So n1 is equal to 0 .1 molar into 10 ml divided by 10 ml...