Boric acid is too weak for direct titration because the pH change near equivalence is gradual. From the list, identify the titrant, indicator and supporting reagent needed, then enter the sum of their

Question

Boric acid is too weak for direct titration because the pH change near equivalence is gradual. From the list, identify the titrant, indicator and supporting reagent needed, then enter the sum of their molecular weights:

Ethanol 46; 2-butanol 74; mannitol 182; NaOH 40; NH₄OH 35; dilute HCl 36.5; phenolphthalein 318.3; methyl orange 327.3; CCl₄ 153.8.

TestHub · Accepted Answer

Mannitol complexes boric acid and increases its effective acidity. NaOH is the titrant. Phenolphthalein is the indicator. Sum = 182 + 40 + 318.3 = 540.3.

Chemistry - Complete P-block Question with Solution | TestHub

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