jakaylagriffin8568 jakaylagriffin8568
  • 25-05-2018
  • Chemistry
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Why does the pink color, which forms at the point where NaOH comes into contact with the solution (HCl) in the flask, disappear more slowly near the endpoint?

Respuesta :

Dejanras
Dejanras Dejanras
  • 03-06-2018
Answer is: because pH value of solution is changing.
Balanced chemical reaction: NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l).
pH of sodium hydroxide solution is above seven (basic), when solution of hydrochloric acid is added, pH slowly dropping until it became neutral solution (pH is equal seven) and that is endpoint of titration.
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