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Calculate the pH at the second stoichiometric point when 160 mL of a 0.020 M solution...

Calculate the pH at the second stoichiometric point when 160 mL of a 0.020 M solution of oxalic acid (Ka1=5.4*10-2, Ka2=5.4*10-5) is titrated with 2.0 M NaOH. What is the most suitable indicator for this titration?

bromocresol purple

bromocresol green

phenol red

methyl red

phenolphthalein

methyl orange t

hymol blue

thymolphthalein

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Answer #1

Oxalic acid or H2C2O4 is a weak acid and NaOH is a strong base, So this titration need a basic indicator. Therefore Phenolphthalein can be used as an indicator in this titration having basic pH range. The pH of phenolphthalein is from 8.3-10 (or pH is > 7)

All other indicators having acidic pH or they are acidic indicators. pH of bromocresol purple is 5.2, bromocresol green is 3.8-5.4. phenol red is 6.8-8.2. ph of hymol blue 2.8, pH of mehtyl orange is 4.3

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