Question

Indicator for the titration of weak acid and strong base is:

• A. litmus
• B. methyl orange
  
• C. phenolphthalein
• D. depend on the neutralization

Answer 1

The correct option is C phenolphthalein

Indicator for the titration of weak acid and strong base is Phenolphthalein Indicator.
Phenolphthalein with a pKa of 9.1 would be a better choice than methyl orange with a pKa of 3.8.
A Basic Titration Curve, The horizontal lines show the range of pH in which phenolphalein (blue) and methyl orange (ed) changes color. The middle line represents the pKa, while the two outer lines represent the end or start of the color changes. The peak and light blue highlights show the range in which the color changes will occur based on the amount of titrant added.