Which of the indicators given in Figure 16.5, methyl violet, bromcresol green, phenol red, or thymolphthalein, would be most appropriate to detect a pH change from: (b) 8 to 10?

Video transcript

Hi everyone for this problem. It reads the ph of a substance changes from 1-3, determine the most suitable indicator. To detect this ph change based on the figure below And were given four indicators. And so what we need to do then with this information is we want to know which one's going to be the best for a ph change of 123. So let's go individually through each to see what the ph change is that they reflect and will estimate this. So for the first indicator, this looks like a ph rain. The ph changes from about 3. to about 5.2 and this is out of that range of the ph changing from 1 to 3. So the first one is not going to be the most suitable indicator for the second indicator. We can estimate that this is about 3. to about 4.2. And this is out of that range of change as well. Of 123 for the third indicator, this looks like it's about 1. to about 2.7 and this does fall in that p Change from 1-3 so we can keep our eye on that one and the last one, the change looks like it's from about zero to 1.7. And this is out of that range. So the most suitable indicator then is going to be the third one time all blue acid range because it change is within that PH of a substance change of 123. So that is it for this problem, I hope this was helpful.