Color of Methyl orange indicator solution in distilled water. --> yellow Number
ID: 827311 • Letter: C
Question
Color of Methyl orange indicator solution in distilled water. --> yellow
Number of drops of 0.10M HCl to turn indicator red.--> 1
Color of Methyl orange indicator solution in buffer solution of HC2H3O2 and NaC2H3O2. -->yellow
Number od drops of 0.10M HCl to turn indicator red. -->16
1. How do your observations indicate that the buffer solution maintains near constancy of pH?
2.How do your observations indicate that a buffer solution has a finite capacity?
3. Why did the color of the methyl orange change at all in the presence of the buffer components?
Explanation / Answer
1. Your observations indicate that the buffer solution maintains near consistent pH because it took 15 additional drops to produce the color change than it took with no buffer.
2. The buffer solution has a finite capacity because it eventually produced the color change, indicating an excess of acid.
3. Because buffers work based on equilibriums of weak acids/bases and by adding excess HCl, you will eventually surpass the buffer capacity by adding too much to the acid side of the equilibrium.