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The most suitable indicator for the titration of HCOOH against NaOH is

(a) methyl orange
(b) phenolphthalein
(c) thymol phthalein
(d) both phenolphthalein and thymol pthalein
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  • Indicator for strong acid-strong base titrations: phenolphthalein, methyl orange
  • Indicator for strong acid-weak base titrations: methyl orange & methyl base
  • Indicator for weak acid-strong base titrations: phenolphthalein,thymol phthalein
  • Indicator for weak acid-weak base titrations: None
Answer: both phenolphthalein and thymol pthalein
HCOOH is a weak acid and NaOH is a strong base, therefore, both phenolphthalein and thymol phthalein can be used as an indicator.
answered Feb 1, 2014 by mosymeow_1
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